1. whim An intellectual fancy is a mental image or picture founded upon slight or whimsical association or resemblance; a conceit has less of the picturesque and more of the theoretic than a fancy; a Synonyms: fancy, belief, desire, imagination, predilection, caprice, humor, inclination, supposition, conceit, idea, liking, vagary, conception, image, mood, whim Antonyms: actuality, certainty, fact, reality, truth, verity