THESAURUS
a bit thick, a bit thin, absurd, bizarre, cockamamie, crazy, doubtable, doubtful, dubious, dubitable, extravagant, fantastic, foolish, grotesque, hard of belief, hard to believe, high-flown, implausible, inconceivable, incredible, laughable, ludicrous, monstrous, nonsensical, not deserving belief, open to doubt, open to suspicion, outrageous, outre, passing belief, poppycockish, preposterous, problematic, questionable, ridiculous, staggering belief, suspect, suspicious, tall, thick, thin, unbelievable, unconvincing, unearthly, ungodly, unimaginable, unthinkable, unworthy of belief, weird, wild
