Greek phantastikós able to present or show (to the mind), equivalent. to *phantad-, base of phantázein to make visible (akin to phānós light, bright, phaínein to make appear) + -tikos -tic
Medieval Latin fantasticus, variant of Late Latin phantasticus
Middle English fantastik pertaining to the imaginative faculty 1350–1400
fan•tas′ti•cal•ly,adv. fan•tas′ti•cal•ness, fan•tas′ti•cal′i•ty,n. 1.Fantastic,bizarre,grotesque share a sense of deviation from what is normal or expected. Fantastic suggests a wild lack of restraint, a fancifulness so extreme as to lose touch with reality:a fantastic scheme for a series of space cities.In informal use, fantastic often means simply "exceptionally good'':a fantastic meal.Bizarre means markedly unusual or extraordinarily strange, sometimes whimsically so:bizarre costumes for Mardi Gras; bizarre behavior.Grotesque implies shocking distortion or incongruity, sometimes ludicrous, more often pitiful or tragic:a grotesque mixture of human and animal features; grotesque contrast between the forced smile and sad eyes: a gnarled tree suggesting the figure of a grotesque human being.