unheard-of

[ uhn-hurd-uhv, -ov, -uh v ]
/ ʌnˈhɜrdˌʌv, -ˌɒv, -əv /

adjective

that was never heard of; unknown: an unheard-of artist.
such as was never known before; unprecedented: an unheard-of salary.
shocking or outrageous: unheard-of conduct.

Origin of unheard-of

First recorded in 1585–95

Example sentences from the Web for unheard-of

British Dictionary definitions for unheard-of

unheard-of

adjective

previously unknown an unheard-of actress
without precedent an unheard-of treatment
highly offensive unheard-of behaviour