adj. 25B6; adjective FICKLE, faithless, unfaithful, false, false-hearted; wayward, unreliable, untrustworthy, capricious, volatile, flighty, unpredictable, erratic, blowing hot and cold; informal cheating, two-timing.
faithful.
INCONSTANT
Meaning of INCONSTANT in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012