unusual

Something unusual is uncommon. It's odd, weird, or out of the ordinary in some way.

Unusual is the opposite of usual, thanks to the prefix un, meaning "not." Unusual things are noteworthy: you don't see them every day. A dog chasing a squirrel is usual. A squirrel chasing a dog would be unusual. Unusual can mean strange and bizarre, or just things that are rare. If someone is always absent, showing up would be unusual. Most surprising things are unusual.

Definitions of unusual
  1. adjective
    not usual or common or ordinary
    “a scene of unusual beauty”
    “a man of unusual ability”
    “cruel and unusual punishment”
    “an unusual meteorite”
    Synonyms:
    uncommon
    not common or ordinarily encountered; unusually great in amount or remarkable in character or kind
    different
    differing from all others; not ordinary
    extraordinary
    (of an official) serving an unusual or special function in addition to those of the regular officials
    odd
    not easily explained
    out-of-the-way
    out of the ordinary
    peculiar
    markedly different from the usual
    unaccustomed
    not customary or usual
    unique
    highly unusual or rare but not the single instance
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    Antonyms:
    usual
    occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure
    common
    having no special distinction or quality; widely known or commonly encountered; average or ordinary or usual
    accustomed, customary, habitual, wonted
    commonly used or practiced; usual
    chronic, inveterate
    habitual
    regular
    in accord with regular practice or procedure
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  2. adjective
    being definitely out of the ordinary and unexpected; slightly odd or even a bit weird
    synonyms: strange
    antic, fantastic, fantastical, grotesque
    ludicrously odd
    crazy
    bizarre or fantastic
    curious, funny, odd, peculiar, queer, rum, rummy, singular
    beyond or deviating from the usual or expected
    eerie, eery, spooky
    inspiring a feeling of fear; strange and frightening
    exotic
    strikingly strange or unusual
    freaky
    strange and somewhat frightening
    gothic
    characterized by gloom and mystery and the grotesque
    oddish
    somewhat strange
    other
    very unusual; different in character or quality from the normal or expected
    quaint
    strange in an interesting or pleasing way
    quaint
    very strange or unusual; odd or even incongruous in character or appearance
    weird
    strikingly odd or unusual
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    Antonyms:
    familiar
    within normal everyday experience; common and ordinary; not strange
    common, usual
    commonly encountered
    common or garden
    the usual or familiar type
    everyday
    commonplace and ordinary
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  3. adjective
    not commonly encountered
    “two-career families are no longer unusual
    Synonyms:
    uncommon
    not common or ordinarily encountered; unusually great in amount or remarkable in character or kind
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