Source : Webster's Revised Unabridged Dictionary (1913)

Unheard \Un*heard"\, a.
   1. Not heard; not perceived by the ear; as, words unheard by
      those present.

   2. Not granted an audience or a hearing; not allowed to
      speak; not having made a defense, or stated one's side of
      a question; disregarded; unheeded; as, to condem? a man
      unheard.

            What pangs I feel, unpitied and unheard! --Dryden.

   3. Not known to fame; not illustrious or celebrated; obscure.

            Nor was his name unheard or unadored. --Milton.

   {Unheard of}.
      (a) Not heard of; of which there are no tidings.
      (b) Unknown to fame; obscure. --Glanvill.