The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

            He shall not live; look, with a spot I damn him.
                                                  --Shak.
      [1913 Webster]

   2. (Theol.) To doom to punishment in the future world; to
      consign to perdition; to curse.
      [1913 Webster]

   3. To condemn as bad or displeasing, by open expression, as
      by denuciation, hissing, hooting, etc.
      [1913 Webster]

            You are not so arrant a critic as to damn them [the
            works of modern poets] . . . without hearing.
                                                  --Pope.
      [1913 Webster]

            Damn with faint praise, assent with civil leer,
            And without sneering teach the rest to sneer.
                                                  --Pope.
      [1913 Webster]

   Note: Damn is sometimes used interjectionally, imperatively,
         and intensively.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Damn \Damn\, v. i.
   To invoke damnation; to curse. "While I inwardly damn."
   --Goldsmith.
   [1913 Webster]

WordNet (r) 3.0 (2006):

damn
    adv 1: extremely; "you are bloody right"; "Why are you so all-
           fired aggressive?" [syn: bloody, damn, all-fired]
    adj 1: used as expletives; "oh, damn (or goddamn)!" [syn:
           damn, goddamn]
    2: expletives used informally as intensifiers; "he's a blasted
       idiot"; "it's a blamed shame"; "a blame cold winter"; "not a
       blessed dime"; "I'll be damned (or blessed or darned or
       goddamned) if I'll do any such thing"; "he's a damn (or
       goddam or goddamned) fool"; "a deuced idiot"; "an infernal
       nuisance" [syn: blasted, blame, blamed, blessed,
       damn, damned, darned, deuced, goddam, goddamn,
       goddamned, infernal]
    n 1: something of little value; "his promise is not worth a
         damn"; "not worth one red cent"; "not worth shucks" [syn:
         damn, darn, hoot, red cent, shit, shucks,
         tinker's damn, tinker's dam]
    v 1: wish harm upon; invoke evil upon; "The bad witch cursed the
         child" [syn: curse, beshrew, damn, bedamn,
         anathemize, anathemise, imprecate, maledict] [ant:
         bless]

Moby Thesaurus II by Grady Ward, 1.0:

197 Moby Thesaurus words for "damn":
   a continental, a curse, a damn, a darn, a hoot, abominate, abuse,
   accurse, accursed, accuse, ace, anathematize, anathemize,
   animadvert on, arraign, attack, attaint, bagatelle, banish, bauble,
   be concerned, bean, berate, bibelot, bit, blackguard, blacklist,
   blame, blaspheme, blast, brass farthing, bring home to,
   bring to ruin, button, call names, call to account, care,
   cast blame upon, cast into hell, cast out, cast reflection upon,
   castigate, censure, cent, complain against, condemn,
   condemn to hell, confound, consign to hell, consume, convict,
   criticize, cry down, cry out against, cry out on, cry shame upon,
   curio, curse, cursed, cuss, cuss out, damnable, damned, darn,
   deal destruction, decimate, decry, denounce, denunciate, depredate,
   desolate, despoil, destroy, devastate, devour, discipline,
   dissolve, doom, doom to perdition, engorge, epithet, epithetize,
   excommunicate, execrable, execrate, expel, farce, farthing,
   feather, fig, find guilty, fleabite, folderol, fribble, frippery,
   fulminate against, gaud, gewgaw, gimcrack, gobble, gobble up,
   goddamn, goddamned, gut, gut with fire, hair, halfpenny, havoc,
   hex, hill of beans, hoot, impeach, imprecate, impugn, incinerate,
   indict, inveigh against, jest, joke, jot, kickshaw, knickknack,
   knickknackery, lay in ruins, lay waste, lota, mind, minikin,
   mockery, modicum, molehill, objurgate, ounce, pass sentence on,
   penalize, peppercorn, picayune, pin, pinch of snuff, pinprick,
   pronounce judgment, pronounce sentence, proscribe, punish, rap,
   ravage, red cent, reflect upon, remonstrate, reprehend, reprimand,
   reproach, reprobate, reprove, revile, row of pins, ruin, ruinate,
   rush, sentence, shake up, shipwreck, shit, shred, snap, sneeshing,
   sou, straw, swallow up, swear, swear at, throw a whammy,
   throw into disorder, thunder against, toy, trifle, trinket,
   triviality, tuppence, two cents, twopence, unleash destruction,
   unleash the hurricane, upbraid, upheave, vandalize, vaporize,
   vilify, vituperate, waste, whim-wham, whit, whoop, worry, wrack,
   wreak havoc, wreck



The Devil's Dictionary (1881-1906):

DAMN, v.  A word formerly much used by the Paphlagonians, the meaning
of which is lost.  By the learned Dr. Dolabelly Gak it is believed to
have been a term of satisfaction, implying the highest possible degree
of mental tranquillity.  Professor Groke, on the contrary, thinks it
expressed an emotion of tumultuous delight, because it so frequently
occurs in combination with the word _jod_ or _god_, meaning "joy."  It
would be with great diffidence that I should advance an opinion
conflicting with that of either of these formidable authorities.