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Definition of unheard–of
: previously unknown; especially : unprecedented moving at unheard–of speeds
Explore Merriam-Webster
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
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: 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
: not known before an unheard-of invention
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See words that rhyme with unheard–of Spanish Central: Translation of unheard–of
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