Bound or obligated, as under a pledge to a particular cause, action, or attitude. Opposite of uncommitted.
"[Narrower terms: bound up, involved, wrapped up; dedicated, devoted; pledged, sworn]" [WordNet 1.5]
Associated in an exclusive sexual relationship; also called attached. Opposite of unattached.
"[Narrower terms: affianced, bespoken, betrothed, engaged, pledged, promised(predicate); married]" [WordNet 1.5]
Consigned involuntarily to custody, as in a prison or mental institution. [WordNet 1.5]

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THESAURUS

committed

abandoned, affianced, afire, altruistic, ardent, assured, beholden, beholden to, betrothed, bound, bound and determined, bounden, bounden to, burning, compromised, consecrated, constant, contracted, decided, decisive, dedicated, definite, determined, devoted, devout, disinterested, duty-bound, earnest, engaged, faithful, fast, fervent, fervid, fiery, flaming, guaranteed, hearty, heated, hot, hot-blooded, humble, impassioned, in duty bound, in earnest, indebted to, intended, intense, intent, intent on, loyal, modest, obligate, obligated, obliged, obliged to, obstinate, on fire, passionate, perfervid, persevering, persistent, pledged, plighted, promised, purposeful, red-hot, relentless, resolute, resolved, sacrificing, saddled, self-abasing, self-abnegating, self-abnegatory, self-denying, self-devoted, self-effacing, self-forgetful, self-immolating, self-neglectful, self-neglecting, self-renouncing, self-sacrificing, self-unconscious, selfless, serious, sincere, single-minded, spirited, staunch, steadfast, sworn, tenacious, tested, tied, tried, tried and true, true, unacquisitive, under obligation, underwritten, unpossessive, unpretentious, unselfish, unsparing of self, vehement, warm, warranted, white-hot, wholehearted, zealous

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ROGET THESAURUS

committed

Promise

N promise, undertaking, word, troth, plight, pledge, parole, word of honor, vow, oath, profession, assurance, warranty, guarantee, insurance, obligation, contract, stipulation, engagement, preengagement, affiance, betroth, betrothal, betrothment, promising, promissory, votive, under hand and seal, upon oath, promised, affianced, pledged, bound, committed, compromised, in for it, as one's head shall answer for, in for a penny in for a pound, ex voto, gage d'amour.

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