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unheard-of

[uhn-hurd-uhv, -ov, -uh v] /ʌnˈhɜrdˌʌv, -ˌɒv, -əv/
adjective
1.
that was never heard of; unknown:
an unheard-of artist.
2.
such as was never known before; unprecedented:
an unheard-of salary.
3.
shocking or outrageous:
unheard-of conduct.
Origin
1585-1595
1585-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unheard of

unheard-of

adjective
1.
previously unknown: an unheard-of actress
2.
without precedent: an unheard-of treatment
3.
highly offensive: unheard-of behaviour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Idioms and Phrases with unheard of

unheard of

Very unusual, extraordinary, as in It's unheard of to have all one's money refunded two years after the purchase. This expression alludes to a circumstance so unusual that it has never been heard of. [ Late 1500s ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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