inconstant

Anything that's inconstant changes all the time. Don’t give your heart to an inconstant friend because she might get distracted and drop it. The moon is inconstant, with all that waxing and waning, but we love it anyway.

You can't exactly count on things — or people — that are inconstant, since they vary or waver so much. Someone who's inconstant is fickle or even undependable. An inconstant friend might promise to come to your party and then fail to show up because she suddenly felt like going bowling instead. When the weather is inconstant, you don’t know what to wear. The Latin root is inconstantem, "changeable or capricious."

Definitions of inconstant
1

adj likely to change frequently often without apparent or cogent reason; variable

inconstant affections”
“an inconstant lover”
“"swear not by...the inconstant moon"- Shakespeare”
Synonyms:
changeable, changeful
such that alteration is possible; having a marked tendency to change
false, untrue
(used especially of persons) not dependable in devotion or affection; unfaithful
fickle, volatile
marked by erratic changeableness in affections or attachments
unfaithful
not true to duty or obligation or promises
unstable
lacking stability or fixity or firmness
variable
liable to or capable of change
volatile
evaporating readily at normal temperatures and pressures
Antonyms:
constant
steadfast in purpose or devotion or affection
unchangeable
not changeable or subject to change
staunch, steadfast, unswerving
firm and dependable especially in loyalty
unfailing, unflagging
unceasing
faithful
steadfast in affection or allegiance
stable
resistant to change of position or condition
invariable
not liable to or capable of change
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