unheard-of

adjective
UK: /ˌʌnˈhɜːd əv/
US: /ˌʌnˈhɜːrd əv/

  1. Very unusual or surprising; something that has not happened or been known before.

    1. That's an unheard-of thing!
    2. It was unheard-of for her to miss a meeting, she was always punctual.

Synonyms

incredible remarkable novel unprecedented unthinkable

Frequently Asked Questions

The phonetic transcription of "unheard-of" is /ˌʌnˈhɜːd əv/ in British English and /ˌʌnˈhɜːrd əv/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "unheard-of": incredible, remarkable, novel, unprecedented, unthinkable.

Example usage of "unheard-of": "That's an unheard-of thing!". More examples on the page.