Etymology
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inconstant (adj.)

c. 1400, "fickle, not steadfast," from Old French inconstant "variable, eccentric" (14c.), from Latin inconstantem (nominative inconstans) "changeable, fickle, capricious," from in- "not, opposite of, without" (see in- (1)) + constantem (see constant). Related: Inconstantly.

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Definitions of inconstant

inconstant (adj.)
likely to change frequently often without apparent or cogent reason; variable; "swear not by...the inconstant moon"- Shakespeare;
inconstant affections
an inconstant lover
From wordnet.princeton.edu