a bit thick a bit thin absurd antic beyond belief doubtable doubtful dubious dubitable fanciful fantastic flimsy hard of belief hard to believe implausible impossible improbable incomprehensible inconceivable incredible mind-boggling not deserving belief open to doubt open to suspicion passing belief preposterous problematic questionable ridiculous staggering belief suspect suspicious tall thick thin unaccountable unconvincing unearthly unexpected ungodly unimaginable unsubstantial unthinkable unworthy of belief weak