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otiose
serving no useful purpose; having no excuse for being
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oaf
an awkward stupid person
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obdurate
stubbornly persistent in wrongdoing
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obeisance
bending the head or body or knee as a sign of reverence or submission or shame or greeting
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obelisk
a stone pillar having a rectangular cross section tapering towards a pyramidal top
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obese
excessively fat
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obfuscate
make obscure or unclear
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obituary
a notice of someone's death; usually includes a short biography
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objective
the goal intended to be attained (and which is believed to be attainable)
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objectivity
judgment based on observable phenomena and uninfluenced by emotions or personal prejudices
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oblation
the act of contributing to the funds of a church or charity
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obligatory
required by obligation or compulsion or convention
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oblige
force somebody to do something
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obliging
showing a cheerful willingness to do favors for others
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oblique
slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled
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obliquity
the quality of being deceptive
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obliterate
remove completely from recognition or memory
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oblong
deviating from a square or circle or sphere by being elongated in one direction
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obloquy
a false accusation of an offense or a malicious misrepresentation of someone's words or actions
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obscure
not clearly understood or expressed
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obsequious
attempting to win favor from influential people by flattery
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obloquy
a false accusation of an offense or a malicious misrepresentation of someone's words or actions
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observant
quick to notice; showing quick and keen perception
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obsolete
no longer in use
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obstinate
tenaciously unwilling or marked by tenacious unwillingness to yield
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obstreperous
noisily and stubbornly defiant
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obtain
come into possession of
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obtrusive
sticking out; protruding
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obtuse
of an angle; between 90 and 180 degrees
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obviate
do away with
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occident
the hemisphere that includes North America and South America
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occlude
block passage through
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occult
supernatural forces and events and beings collectively
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octogenarian
being from 80 to 89 years old
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ocular
of or relating to or resembling the eye
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ode
a lyric poem with complex stanza forms
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odious
unequivocally detestable
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odoriferous
emitting an odor
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odyssey
a long wandering and eventful journey
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offal
viscera and trimmings of a butchered animal often considered inedible by humans
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offertory
the offerings of the congregation at a religious service
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officiate
act in an official capacity in a ceremony or religious ritual, such as a wedding
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officious
intrusive in a meddling or offensive manner
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offset
a compensating equivalent
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ogle
look at with amorous intentions
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ogre
(folklore) a giant who likes to eat human beings
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oleaginous
containing an unusual amount of grease or oil
-
oligarchy
a political system governed by a few people
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oleo
a spread made chiefly from vegetable oils and used as a substitute for butter
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ominous
threatening or foreshadowing evil or tragic developments
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omnibus
a vehicle carrying many passengers; used for public transport
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omnipotent
having unlimited power
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omniscient
infinitely wise
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onerous
not easily borne; wearing
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onslaught
(military) an offensive against an enemy (using weapons)
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ontology
the metaphysical study of the nature of being and existence
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onus
an onerous or difficult concern
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opaque
not transmitting or reflecting light or radiant energy; impenetrable to sight
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operative
effective; producing a desired effect
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operetta
a short amusing opera
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opiate
a narcotic drug that contains opium or an opium derivative
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opine
express one's opinion openly and without fear or hesitation
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opportune
suitable or at a time that is suitable or advantageous especially for a particular purpose
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oppress
come down on or keep down by unjust use of one's authority
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oppressive
weighing heavily on the senses or spirit
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opprobrious
expressing offensive reproach
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opprobrium
a state of extreme dishonor
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oppugn
challenge the accuracy, probity, or propriety of
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opt
select as an alternative over another
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optimum
most desirable possible under a restriction expressed or implied
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optional
possible but not necessary; left to personal choice
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opulence
wealth as evidenced by sumptuous living
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opus
a musical work that has been created
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oracle
a shrine where an oracular god is consulted
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oration
an instance of oratory
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orator
a person who delivers a speech or oration
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orb
an object with a spherical shape
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orchestrate
plan and direct (a complex undertaking)
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ordain
invest with ministerial or priestly authority
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orderly
clean or organized
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ordinance
an authoritative rule
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ordnance
military supplies
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orient
the hemisphere that includes Eurasia and Africa and Australia
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orison
reverent petition to a deity
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ornate
marked by elaborate rhetoric and elaborated with decorative details
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ornithology
the branch of zoology that studies birds
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orthodox
adhering to what is commonly accepted
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oscillate
move or swing from side to side regularly
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ossify
become bony
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ostensible
appearing as such but not necessarily so
-
ostentatious
intended to attract notice and impress others
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ostracize
expel from a community or group
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otherworldly
existing outside of or not in accordance with nature
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ouster
a person who ousts or supplants someone else
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outmoded
out of fashion
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outre
conspicuously or grossly unconventional or unusual
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outset
the time at which something is supposed to begin
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ovation
enthusiastic recognition (especially one accompanied by loud applause)
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overrule
rule against
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overture
orchestral music played at the beginning of an opera or oratorio
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overweening
presumptuously arrogant
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overwhelm
cover completely or make imperceptible
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overwrought
deeply agitated especially from emotion
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ovum
the female reproductive cell; the female gamete