Synonyms and related words :
Gothic, a bit thick, a bit thin, absurd, asinine, balmy, barmy, baroque, barred, batty, beyond belief, bizarre, brain-born, closed-out, cockamamie, contrary to reason, crazy, cuckoo, cutthroat, dotty, doubtable, doubtful, dream-built, dubious, dubitable, exacting, excessive, excluded, exorbitant, extortionate, extraordinary, extravagant, extreme, fanciful, fancy, fancy-born, fancy-built, fancy-woven, fantasque, fantastic, fatuitous, fatuous, florid, foolish, gouging, grossly overpriced, grotesque, hard of belief, hard to believe, harebrained, high-flown, hopeless, idiotic, imbecilic, immoderate, implausible, impossible, inconceivable, incredible, inflationary, inordinate, insane, irrational, laughable, logically impossible, loony, ludicrous, mad, maggoty, mindless, monstrous, moronic, nonmeritorious, nonsensical, not coming, not deserving belief, not outstanding, not possible, notional, nutty, open to doubt, open to suspicion, out of bounds, out of sight, outlandish, outrageous, outre, overpriced, oxymoronic, paradoxical, passing belief, poppycockish, potty, problematic, prohibited, prohibitive, questionable, ridiculous, risible, rococo, ruled-out, screwy, self-contradictory, senseless, silly, skyrocketing, spiraling, staggering belief, suspect, suspicious, tall, thick, thin, unbelievable, unconscionable, unconvincing, undeserved, undeserving, undue, unearned, unearthly, unentitled, ungodly, unimaginable, unjustified, unmerited, unmeriting, unowed, unowing, unreasonable, unthinkable, unwarranted, unworthy, unworthy of belief, usurious, wacky, weird, whimsical, wild