The Collaborative International Dictionary of English v.0.48:

Forebode \Fore*bode"\, v. t. [imp. & p. p. Foreboded; p. pr. &
   vb. n. Foreboding.] [AS. forebodian; fore + bodian to
   announce. See Bode v. t.]
   1. To foretell.
      [1913 Webster]

   2. To be prescient of (some ill or misfortune); to have an
      inward conviction of, as of a calamity which is about to
      happen; to augur despondingly.
      [1913 Webster]

            His heart forebodes a mystery.        --Tennyson.
      [1913 Webster]

            Sullen, desponding, and foreboding nothing but wars
            and desolation, as the certain consequence of
            C[ae]sar's death.                     --Middleton.
      [1913 Webster]

            I have a sort of foreboding about him. --H. James.

   Syn: To foretell; predict; prognosticate; augur; presage;
        portend; betoken.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Foreboding \Fore*bod"ing\, n.
   Presage of coming ill; expectation of misfortune.
   [1913 Webster]

WordNet (r) 3.0 (2006):

foreboding
    adj 1: ominously prophetic [syn: fateful, foreboding(a),
           portentous]
    n 1: a feeling of evil to come; "a steadily escalating sense of
         foreboding"; "the lawyer had a presentiment that the judge
         would dismiss the case" [syn: foreboding, premonition,
         presentiment, boding]
    2: an unfavorable omen

Moby Thesaurus II by Grady Ward, 1.0:

227 Moby Thesaurus words for "foreboding":
   abusive, actuarial prediction, advance notice, affect, affection,
   agitated, agitation, all-overish, all-overs, angst, anxiety,
   anxiety hysteria, anxiety neurosis, anxious, anxious bench,
   anxious concern, anxious seat, anxioused up, anxiousness,
   apocalypse, apocalyptic, apprehension, apprehensive,
   apprehensiveness, augury, bad, baleful, baneful, black,
   bludgeoning, blustering, bodeful, boding, bothered, browbeating,
   bulldozing, bullying, cankerworm of care, care, clairvoyance,
   commination, comminatory, concern, concerned, concernment, dark,
   denunciation, denunciatory, dire, disquiet, disquieted,
   disquietude, distress, disturbance, disturbed, doomful, doubt,
   dread, dreary, emotion, emotional charge, emotional shade,
   empty threat, evil, evil-starred, experience, fateful, fear,
   fear-inspiring, fearful, feeling, feeling tone, forebodingness,
   forecast, forecasting, forefeeling, foreknowing, foreknowledge,
   forerunning, foreseeability, foreshadowing, foreshowing, foresight,
   foretelling, foretoken, forewarning, forewisdom, funny feeling,
   gloomy, guesswork, gut reaction, heartthrob, hectoring, hunch,
   idle threat, ill, ill-boding, ill-fated, ill-omened, ill-starred,
   imminence, imminent, implied threat, impression, improbability,
   in a pucker, in a stew, inauspicious, inquietude, intimation,
   intimidating, intimidation, intuition, intuitive impression,
   lowering, malaise, menace, menacing, minacious, minatory,
   misgiving, nervous, nervous strain, nervous tension, nervousness,
   of evil portent, omen, ominous, on tenterhooks, overanxiety,
   overanxious, overapprehensive, passion, perturbation, perturbed,
   pins and needles, plenty of notice, portending, portent,
   portentous, preapprehension, precautional, precautionary,
   precautioning, precognition, precursive, precursory, prediction,
   prefiguration, prefigurement, prefiguring, premonition,
   premonitory, prenotice, prenotification, prenotion, presage,
   presaging, prescience, presentiment, preshowing, presignifying,
   prewarning, probability, prodromal, prodromic, profound sense,
   prognosis, prognostic, prognostication, promise, promise of harm,
   prophecy, prophesying, prospectus, pucker, qualm, qualmishness,
   reaction, response, sensation, sense, sentiment, sign, sinister,
   solicitous, solicitude, somber, soothsay, speculation,
   statistical prediction, stew, strain, strained, suspense,
   suspenseful, suspicion, sword of Damocles, tense, tension,
   terroristic, terrorizing, threat, threatening, threateningness,
   threatful, threatfulness, trouble, troubled, undercurrent,
   uneasiness, uneasy, unfavorable, unfortunate, unlucky, unpromising,
   unpropitious, unquietness, untoward, upset, vague feeling,
   vague idea, vaticination, vexation, warning, zeal, zealous