aberration, abnormality, anomaly, apparition, boutade, brainchild, brainstorm, bubble, capriccio, caprice, chimera, conceit, crackpotism, crank, crankiness, crankism, craze, crazy idea, crotchet, crotchetiness, delirium, deviancy, deviation, differentness, disposition, divergence, dottiness, dream, eccentricity, eidolon, erraticism, erraticness, fad, fancy, fantasque, fantastic notion, fantasy, fiction, figment, flimflam, fool notion, freak, freakiness, freakish inspiration, freakishness, hallucination, harebrained idea, humor, idea, idiocrasy, idiosyncrasy, idle fancy, illusion, imagery, imagination, imagining, inclination, insubstantial image, invention, irregularity, kink, maggot, make-believe, mannerism, megrim, myth, nonconformity, notion, oddity, passing fancy, peculiarity, phantasm, phantom, queerness, quip, quirk, quirkiness, romance, sick fancy, singularity, strangeness, thick-coming fancies, thought, toy, trick, trip, twist, unconventionality, unnaturalness, vagary, vapor, vision, whim, whim-wham, whimsicality, wildest dreams