THESAURUS
pledged
affianced, affirmed, alleged, announced, answerable for, as earnest, asserted, asseverated, assured, at stake, attested, averred, avouched, avowed, beholden, beholden to, betrothed, bound, bounden, bounden to, certified, chargeable, committed, compromised, contracted, declared, deposed, deposited, duty-bound, engaged, enunciated, guaranteed, in duty bound, in hock, in pawn, indebted to, intended, liable, manifestoed, obligate, obligated, obliged, obliged to, on deposit, pawned, plighted, posted, predicated, professed, promised, pronounced, put up, responsible, saddled, staked, stated, sworn, sworn to, tied, under obligation, underwritten, up the spout, vouched, vouched for, vowed, warranted
ROGET THESAURUS
pledged
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.