American Dictionary

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Definition unbelievable in American English

unbelievable adjective

adjective
/ˌʌnbɪˈlivəb(ə)l/
1

used for emphasizing how good, bad, impressive, etc. something is

Example

The cheering inside the stadium was unbelievable.

Example

Williams played an unbelievable match (=she played very well).

Synonyms and related words
2

too unlikely to be true or believed

Example

The acting was fairly good, although the plot was unbelievable.

Synonyms and related words
Definition unbelievable in American English