differentiate, v. discriminate.

differentiation, n. discrimination.

difficult, a. arduous, onerous, complicated, intricate, hard; uncompliant, intractable, perverse, fastidious, exacting.  Antonyms:  facile, light, easy.

difficulty, n. obstacle, impediment, obstruction; arduousness, hardness; controversy, disagreement, objection, cavil; predicament, quandary, dilemma.  Antonyms:  ease, facility, extrication, release.

diffidence, n. timidity, bashfulness.

diffident, a. bashful, timid, shy.

diffuse, a. copious, full, verbose, prolix.

dig, v. delve, excavate, scoop; thrust, poke, punch, jab; exhume (dig up).

dig, n. thrust, punch, poke; grind (student).

digest, v. codify, systematize, methodize, classify.

digest, n. pandect, summary, code, system, abridgment.

digestion, n. eupepsia.  Antonyms:  indigestion, dyspepsia.  Associated Words:  peptics, pepsin, peptic, pepticity, chyme, chyle, digestible, digestibility, indigestible, indigestibility.

digging, n. excavation; exhumation (digging up).  Associated words:  fossorial, fodient.

diggings, n. pl. (Slang) region, locality.

dignified, a. stately, majestic, august, imposing, decorous.  Antonyms:  See undignified.

dignify, v. exalt, grace, ennoble, honor, elevate.

dignity, n. exaltation, eminence; stateliness; honor, preferment.

digress, v. deviate, depart, wander, turn aside.

digression, n. deviation, divergence; episode, incident.

dike, n. levee, embankment.

dike warden. dikereeve.

dilapidated, a. ramshackle, dismantled.

dilate, v. expand, distend; expatiate.

dilation, n. expansion, dilatation, distention; expatiation.

dilemma, n. predicament, quandary, difficulty, strait, pickle.  Antonyms:  extrication, release.

diligence, n. assiduity, sedulousness, sedulity, perseverance, stagecoach (France).

diligent, a. sedulous, industrious, assiduous, persevering.  Antonyms:  See lazy.

dillydally, v. dawdle, dally, fritter, trifle, loiter.

dillydallying, n. dawdling, loitering, trifling, dalliance.

dilute, v. attenuate, thin, weaken, reduce.

diluter, n. diluent, attenuant.

dilution, n. attenuation, thinning, reduction.

dim, a. obscure, indistinct, faint, sullied, blurred.  Antonyms:  bright, vivid, intense, clear.

dim, v. bedim, obscure, darken, dull, eclipse, blur, tarnish.

diminish, v. decrease, reduce, abate, lessen, contract, curtail.

diminution, n. reduction, decrease, abatement, decrement.

dim-sighted, a. purblind, moonblind.

din, n. clamor, noise, racket, uproar, hubbub, clangor, hullabaloo.

dinner, n.  Associated Words:  prandial, post-prandial, croupier, ante-prandial, dine, diner.