unheard–of

play
adjective un·heard–of \ˌən-ˈhərd-ˌəv, -ˌäv\

Definition of unheard–of

  1. :  previously unknown; especially :  unprecedented moving at unheard–of speeds

First Known Use of unheard–of

1592


UNHEARD–OF Defined for English Language Learners

unheard-of

play
adjective

Definition of unheard–of for English Language Learners

  • : not known to have existed or happened before : very unusual


UNHEARD–OF Defined for Kids

unheard–of

play
adjective un·heard–of \ˌən-ˈhərd-ˌəv, -ˌäv\

Definition of unheard–of for Students

  1. :  not known before an unheard-of invention


Learn More about unheard–of


Seen and Heard

What made you want to look up unheard–of? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a confused struggle

Get Word of the Day daily email!

Test Your Vocabulary

July 2017 Words of the Day Quiz

  • alt-597a99e699d07
  • Which is a synonym of gauche?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!