Ficklest

[fik-uh l] /ˈfɪk əl/

adjective
1.
likely to change, especially due to caprice, irresolution, or instability; casually changeable:
fickle weather.
2.
not constant or loyal in affections:
a fickle lover.
/ˈfɪkəl/
adjective
1.
changeable in purpose, affections, etc; capricious
adj.

c.1200, probably from Old English ficol “deceitful, cunning, tricky,” related to befician “deceive,” and to facen “deceit, treachery.” Common Germanic (cf. Old Saxon fekan “deceit,” Old High German feihhan “deceit, fraud, treachery”), from PIE *peig- “evil-minded, treacherous, hostile” (cf. Latin piget “it irks, troubles, displeases,” piger “reluctant, lazy”). Sense of “changeable” is first recorded late 13c. Related: Fickleness.