improbable Synonyms

marvelous unlikely unconvincing marvellous unbelievable tall slimmer wonderwork unthinkable difficult to believe weak unexpected uncredible unconceivable uncertain thin strained beyond belief unrealistic cock-and-bull hard to swallow highly unlikely wonderworking untrusty unthought-of unsuspected unpromising unpredicted unpersuasive unimagined unfeasible out of the question not likely unimaginable splendid small slim implausible flimsy fishy farfetched fantastic fanciful faint fabulous extraordinary dubitable dubious doubtful doubtable