unbelievable
adjective
un·be·liev·able
| \ ˌən-bə-ˈlē-və-bəl
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Definition of unbelievable
: too improbable for belief
the plot is unreal and unbelievable
also
: of such a superlative degree as to be hard to believe
the destruction was unbelievable made an unbelievable catch in center field