Source : Webster's Revised Unabridged Dictionary (1913)

Unanswered \Un*an"swered\, a.
   1. Not answered; not replied; as, an unanswered letter.

   2. Not refuted; as, an unanswered argument.

   3. Not responded to in kind; unrequited; as, unanswered
      affection.

Source : WordNet®

unanswered
     adj : not returned in kind; "unrequited (unanswered) love" [syn: {unreciprocated},
            {unrequited}]