fickle (adj.) Look up fickle at Dictionary.com
c.1200, "false, treacherous, deceptive, deceitful, crafty," probably from Old English ficol "deceitful, cunning, tricky," related to befician "deceive," and to facen "deceit, treachery." Common Germanic (compare Old Saxon fekan "deceit," Old High German feihhan "deceit, fraud, treachery"), from PIE *peig- (2) "evil-minded, treacherous, hostile" (see foe). Sense of "changeable" is from c.1300 (especially of Fortune and women). Related: Fickleness. Fikel-tonge (late 14c.) as an allegorical or character name for "one who speaks falsehoods."