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. adjective
    likely to change frequently often without apparent or cogent reason; variable
    inconstant affections”
    “"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
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    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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