not heard; not perceived by the ear.
not given a hearing or audience.
Archaic. unheard-of.

1250–1300; Middle English unherd. See un-1, heard

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World English Dictionary
unheard (ʌnˈhɜːd)
1.  not heard; not perceived by the ear
2.  not listened to or granted a hearing: his warning went unheard
3.  archaic unheard-of

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1300 "not detected by sense of hearing," from un- (1) "not" + pp. of hear. Meaning "unknown, new" is attested from late 14c. (O.E. had ungehered in this sense). Usually with of since 1590s. Cf. O.N. oheyrðr, Dan. uhørt, M.Du. ongehoort, O.H.G. ungehoret.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The silent electric drive of the vehicles allowed the team to approach unheard
  and unseen as they nosed into the village.
Too often, such protests are going unheard among collectors.
He could hear their squeaking cackles, a sound unheard by humans for decades.
And he began to wonder if he was seeing something virtually unheard of: forged
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