Ludicrously odd:
— Fantastic Halloween costumes.

synonyms: antic, fantastical, grotesque.

Roget 497: absurd, nonsensical, preposterous, egregious, senseless, inconsistent, ridiculous, extravagant, quibbling; self-annulling, self-contradictory; macaronic^†, punning.    foolish etc. 499; sophistical etc. 477; unmeaning etc. 517; without rhyme or reason; fantastic.    ... show more

Roget 853: ridiculous, ludicrous; comical; droll, funny, laughable, pour rire, grotesque, farcical, odd; whimsical, whimsical as a dancing bear; fanciful, fantastic, queer, rum, quizzical, quaint, bizarre; screaming; eccentric etc. (unconformable) 83; strange, outlandish, out of the way, baroque, weird; awkward etc. (ugly) 846.    extravagant, outre, monstrous, preposterous, bombastic, inflated, stilted, burlesque, mock heroic.    drollish; seriocomic, tragicomic; gimcrack, contemptible etc. (unimportant) 643; doggerel; ironical etc. (derisive) 856; risible.    ... show more

Roget 608: capricious; erratic, eccentric, fitful, hysterical; full of whims etc. n.; maggoty; inconsistent, fanciful, fantastic, whimsical, crotchety, kinky [U.S.], particular, humorsome^†, freakish, skittish, wanton, wayward; contrary; captious; arbitrary; unconformable etc. 83; penny wise and pound foolish; fickle etc. (irresolute) 605; frivolous, sleeveless, giddy, volatile.    ... show more

Roget 83: uncomformable, exceptional; abnormal, abnormous^†; anomalous, anomalistic; out of order, out of place, out of keeping, out of tune, out of one's element; irregular, arbitrary; teratogenic; lawless, informal, aberrant, stray, wandering, wanton; peculiar, exclusive, unnatural, eccentric, egregious; out of the beaten track, off the beaten track, out of the common, out of the common run; beyond the pale of, out of the pale of; misplaced; funny.    unusual, unaccustomed, uncustomary, unwonted, uncommon; rare, curious, odd, extraordinary, out of the ordinary; strange, monstrous; wonderful etc. 870; unexpected, unaccountable; outre [Fr.], out of the way, remarkable, noteworthy; queer, quaint, nondescript, none such, sui generis [Lat.]; unfashionable; fantastic, grotesque, bizarre; outlandish, exotic, tombe des nues [Fr.], preternatural; denaturalized^†.    heterogeneous, heteroclite [Gramm.], amorphous, mongrel, amphibious, epicene, half blood, hybrid; androgynous, androgynal^†; asymmetric etc. 243; adelomorphous^†, bisexual, hermaphrodite, monoclinous^†.    qualified etc. 469.    singular, unique, one-of-a-kind.    newfangled, novel, non-classical; original, unconventional, unheard of, unfamiliar; undescribed, unprecedented, unparalleled, unexampled.    ... show more

Roget 515: imagined etc. v.; ben trovato [It]; air drawn, airbuilt^†.    imagining etc. v., imaginative; original, inventive, creative, fertile.    romantic, high flown, flighty, extravagant, fanatic, enthusiastic, unrealistic, Utopian, Quixotic.    ideal, unreal; in the clouds, in nubibus [Lat.]; unsubsantial^† etc. 4; illusory etc. (fallacious) 495.    fabulous, legendary; mythical, mythic, mythological; chimerical; imaginary, visionary; notional; fancy, fanciful, fantastic, fantastical^†; whimsical; fairy, fairy-like; gestic^†.    ... show more

Extraordinarily good or great; used especially as intensifiers:
— A fantastic trip to the Orient.
— The film was fantastic!.

synonyms: grand, howling, marvellous, marvelous, rattling, terrific, tremendous, wonderful, wondrous.

Polish: kapitalny, fenomenalny, fantastyczny, rewelacyjny

Fanciful and unrealistic; foolish:
— A fantastic idea of his own importance.

synonym: wild.

Existing in fancy only:
— Fantastic figures with bulbous heads the circumference of a bushel.

synonym: fantastical.

Polish: fantastyczny

Extravagantly fanciful in design, construction, appearance.