unheard-of

[uhn-hurd-uhv, -ov, -uhv]
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:
1585–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
unheard-of
 
adj
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 10th Edition
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