Synonyms to hard to believe

absurd, Pickwickian, a bit thick, a bit thin, abnormal, amusing, anomalous, asinine, balmy, barred, beyond belief, bizarre, childish, closed-out, cockamamie, comic, contrary to reason, crazy, curious, daft, disproportionate, doubtable, doubtful, droll, dubious, dubitable, eccentric, empty, excluded, extravagant, fantastic, farcical, fatuitous, fatuous, foolish, freaked out, freaky, funny, futile, grotesque, hard of belief, harebrained, high-flown, hilarious, hollow, hopeless, humorous, idiotic, idle, illogical, imbecile, imbecilic, implausible, impossible, inane, incoherent, incommensurable, incommensurate, incompatible, inconceivable, incongruous, inconsequent, inconsistent, inconsonant, incredible, insane, irrational, irreconcilable, kooky, laughable, logically impossible, loony, ludicrous, mad, meaningless, monstrous, moronic, nonsensical, not deserving belief, not possible, nuts, nutty, odd, oddball, off, off the wall, open to doubt, open to suspicion, out, out of proportion, outlandish, outrageous, outre, oxymoronic, paradoxical, passing belief, passing strange, peculiar, poppycockish