decayed, a. rotten, corrupt, putrefied, carious, putrescent, decomposed.

decaying, a. rotting, corrupt, mouldering, decadent, putrefying, carious.  Antonym:  imputrescible.

decease, n. demise, death.

deceased person. decedent.

deceit, n. deception, imposition, trickery, chicanery, artifice, delusion, circumvention, guile, duplicity, imposture finesse, dissimulation, cozenage, trumpery, fallacy.

deceitful, a. deceptive, illusive, insidious, fraudulent, wily, artful, disingenuous.

deceivable, a. deceptible, gullible, credulous.  Antonyms:  indeceptible, undeceivable.

deceive, v. delude, beguile, mislead, gull, impose upon, dupe, circumvent, hoodwink, bamboozle.  Antonyms:  undeceive, disillusionize, disabuse.

deceiver, n. impostor, charlatan, mountebank, swindler, knave, cogger.

decency, n. propriety, seemliness, decorum, modesty, Antonyms:  See indecency.

decent, a. suitable, modest, decorous, seemly, respectable.  Antonyms:  See indecent.

deception, n. imposition, craft, duplicity, deceit, hoax, fallacy, ruse, imposture, artifice, illusion, prevarication, finesse, dissimulation, cozenage, sophistry, coggery.  Antonyms:  guilelessness, candor, disillusionment, fair dealing, sincerity.

deceptive, a. delusive, fallacious, deceitful, specious, insidious, sophistical.  Antonyms:  guileless, candid, ingenuous, sincere, open.

decharm, v. disillusionize, disenchant, disabuse.

decide, v. determine, settle, conclude, resolve.

decided, a. unequivocal, determined, pronounced, unwavering, positive, incontrovertible.

decision, n. determination, settlement, conclusion, verdict, inference, deduction; firmness, resolution, constancy, steadfastness.  Antonyms:  indecision, irresolution, vacillation.

decisive, a. conclusive, final, peremptory, summary.

deck, v. bedeck, bedizen, array.

declaration, n. assertion, affirmation, avowal, predication, pronunciamento.

declare, v. affirm, assert, aver, state, asseverate, predicate.

decline, v. lean, incline, bend; languish, sink, wane, diminish, decrease, deteriorate, retrograde; deviate, stray; shun, refuse.

decline, n. deterioration, retrogradation, diminution, retrogression, degeneracy, declension, declination, decay; progressive emaciation, marasmus.  Antonyms:  progress, advancement, improvement.

decolor, v. decolorate, decolorize.

decorate, v. embellish, adorn, beautify, ornament, garnish, enrich, trim, bedizen, bedeck.

decorated, a. embellished, ornate, ornamented, trimmed.  Antonyms:  See plain.

decoration, n. embellishment, garniture, bedizenment, adorning, ornamentation, decking, insignia, regalia, purfling; paraphernalia.

decorative, a. ornamental, embellishing, adorning.

decoy, v. entice, lure, allure, ensnare, entrap.