unbelievable

The word unbelievable describes something that is beyond understanding, like the idea, until the Middle Ages, that the earth might actually be round.

Unbelievable refers to something that seems incredible (Did you hear the story about the guy who was rescued after being stranded at sea for 6 months on a sailboat?), but it can also refer to something that's so unlikely, so improbable, that you're probably not going to be convinced by it (Hey, did you hear the story about the guy who was rescued after being stranded at sea for 6 months with only a log to keep him afloat?).

Definitions of unbelievable
  1. adjective
    beyond belief or understanding
    synonyms: incredible
    flimsy, unconvincing
    not convincing
    astounding, dumbfounding, dumfounding
    bewildering or striking dumb with wonder
    fabulous
    barely credible
    improbable, marvellous, marvelous, tall
    too improbable to admit of belief
    undreamed, undreamed of, undreamt, undreamt of, unimagined
    not imagined even in a dream
    incredulous
    not disposed or willing to believe; unbelieving
    implausible
    having a quality that provokes disbelief
    unthinkable
    incapable of being conceived or considered
    see moresee less
    Antonyms:
    believable, credible
    capable of being believed
    likely
    within the realm of credibility
    presumptive
    affording reasonable grounds for belief or acceptance
    plausible
    apparently reasonable and valid, and truthful
    thinkable
    capable of being conceived or imagined or considered
    show more antonyms...
  2. adjective
    having a probability too low to inspire belief
    synonyms: improbable, unconvincing, unlikely
    implausible
    having a quality that provokes disbelief
Word Family