inconstant

Changing or varying, especially often and without discernible pattern or reason.

Fickle; faithless.

Not constant; subject to change; not firm; unsteady; fickle; capricious: said chiefly of persons: as, inconstant in love or friendship.

Synonyms Unstable, vacillating, wavering, volatile, unsettled, uncertain.

Not constant; not stable or uniform; subject to change of character, appearance, opinion, inclination, or purpose, etc.; not firm; unsteady; fickle; changeable; variable; — said of persons or things.

Not constant; wavering.

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