regret

regret (http://definr.com/regret)

     n : sadness associated with some wrong done or some
         disappointment; "he drank to drown his sorrows"; "he
         wrote a note expressing his regret" [syn: sorrow, ruefulness]
     v 1: feel remorse for; feel sorry for; be contrite about [syn: repent,
           rue]
     2: feel sad about the loss or absence of
     3: decline formally or politely; "I regret I can't come to the
        party"
     4: be sorry; "I regret to say..."
     5: regret strongly [syn: deplore, lament, bewail, bemoan]