Source : Webster's Revised Unabridged Dictionary (1913)

Damn \Damn\ (d[a^]m), v. t. [imp. & p. p. {Damned} (d[a^]md or
   d[a^]m"n[e^]d); p. pr. & vb. n. {Damning} (d[a^]m"[i^]ng or
   d[a^]m"n[i^]ng).] [OE. damnen dampnen (with excrescent p),
   OF. damner, dampner, F. damner, fr. L. damnare, damnatum, to
   condemn, fr. damnum damage, a fine, penalty. Cf. {Condemn},
   {Damage}.]
   1. To condemn; to declare guilty; to doom; to adjudge to
      punishment; to sentence; to censure.

            He shall not live; look, with a spot I damn him.
                                                  --Shak.

   2. (Theol.) To doom to punishment in the future world; to
      consign to perdition; to curse.

   3. To condemn as bad or displeasing, by open expression, as
      by denuciation, hissing, hooting, etc.

            You are not so arrant a critic as to damn them [the
            works of modern poets] . . . without hearing.
                                                  --Pope.

            Damn with faint praise, assent with civil leer, And
            without sneering teach the rest to sneer. --Pope.

   Note: Damn is sometimes used interjectionally, imperatively,
         and intensively.

Damning \Damn"ing\, a.
   That damns; damnable; as, damning evidence of guilt.

Source : WordNet®

damning
     adj : threatening with damnation [syn: {damnatory}]