fantasyEnglishOxford American Thesaurusfantasy noun 1 the movie is ambitious in its mix of fantasy and realism: imagination, creativity, fancy, invention, originality, vision, speculation, make-believe, daydreaming, reverie. ▷antonyms truth, realism. 2 his fantasy about appearing on television: dream, daydream, pipe dream, flight of fancy, fanciful notion, wish, wishful thinking; fond hope, chimera, delusion, illusion, figment of the imagination, castle in the air, castle in Spain; informal pie in the sky, cloud cuckoo land. 3 fantasy was considered a subset of science fiction for a long time: myth, legend, fable, fairy tale, romance; science fiction, sci-fi, horror; sword and sorcery; escapism. ▷antonyms realism.