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fickle

/ˈfɪk.əl/ adjective

In Latin: inconstans, instabilis Wiktionary

Origin

From Middle English fikil, fikel, from Old English ficol (“fickle, cunning, tricky, deceitful”), equivalent to fike + -le. More at fike.

From Wiktionary, via Kaikki.org (CC BY-SA)