This section is from the book "Hill's Manual Of Social And Business Forms: A Guide To Correct Writing", by Thos. E. Hill. Also available from Amazon: Hill's Manual Of Social And Business Forms: The How-To-Do-Everything Book Of Victorian America.
Diffident - retiring, fearful, bashful, distrustful, modest, hesitating.
Dignified - exalted, elevated, honored, stately.
Diligent - industrious, assiduous, laborious, active, persevering, attentive.
Diminish - shorten, curtail, abate, decrease, lessen, subside.
Direct - show, guide, conduct, manage, regulate, sway.
Directly - at once, quickly, immediately, instantly, promptly, instantaneously.
Disagree - dispute, dissent, differ, quarrel, vary.
Disappoint - foil, defeat.
Disaster - misfortune, calamity, mischance, mishap.
Disavow - disown, deny, disclaim, repudiate.
Discard - cast off, dismiss, discharge.
Discern - distinguish, discriminate, penetrate, behold, discover.
Discernible - plain, evident, perceptible, manifest, apparent.
Disclose - reveal, discover, divulge.
Disconcert - disorder, confuse, defeat, ruffle, fret, vex, unsettle, interrupt, derange.
Discord - contention, dissension, inharmony.
Discover - make known, detect, communicate, reveal, impart, tell, disclose.
Discredit - dishonor, scandal, disgrace, disrepute, ignominy, reproach.
Discretion - prudence, judgment.
Disdain - scorn, contempt, pride, arrogance, haughtiness.
Disease - sickness, distemper, malady, disorder.
Disgrace - degrade, debase, dishonor, abase.
Disguise - cover, disfigure, conceal, dissemble.
Disgust - loathing, nausea, dislike, aversion.
Dishonor - shame, disgrace.
Dislike - antipathy, aversion, repugnance, hatred, contempt, ab-horrence.
Dismiss - discharge, divest, discard.
Disorder - confusion, bustle, disease, tumult, malady, distemper, irregularity.
Disparage - lower, undervalue, degrade, detract, decry, depreciate.
Disperse - scatter, dissipate, deal out, spread, distribute.
Display - parade, exhibit, show, ostentation.
Displease - offend, anger, vex.
Dispose - regulate, place, arrange, order, adapt.
Dispute - contest, debate, quarrel, altercation, difference, controversy.
Disseminate - spread, circulate, scatter, propagate.
Dissertation - discourse, essay, treatise, disquisition.
Dissipate - disperse, squander, waste, expend, consume., dispel.
Distaste - aversion, disgust, contempt, dislike, dissatisfaction, loathing.
Distinct - clear, obvious, different, separate, unlike, dissimilar.
Distinguish - discriminate, know, see, perceive, discern.
Distinguished - noted, eminent, conspicuous, celebrated, illustrious.
Distress - grief, sorrow, sadness, suffering, affliction, agony, pain, anguish, misery.
Distribute - deal out, scatter, assign, allot, apportion, divide.
District - locality, section, tract, region, territory, province, circuit, county.
Diversion - enjoyment, pastime, recreation, amusement, deviation, sport.
Divide - separate, part, share, distribute.
Divine - suppose, conjecture, foretell, guess.
Divulge - disclose, impart, reveal, communicate, publish.
Docile - gentle, tractable, pliant, teachable, yielding, quiet.
Doctrine - belief, wisdom, dogma, principle, precept.
Dogmatical - positive, authoritative, arrogant, magisterial, confident.
Doleful - awful, dismal, sorrowful, woeful, piteous, rueful.
Doubt - suspense, hesitation, perplexity, scruple, uncertainty.
Doubtful - unstable uncertain, dubious, precarious, equivocal.
Drag - pull, bring, haul, draw.
Dread - fear, apprehension.
Dreadful - fearful, frightful, terrible, awful, horrible.
Dress - array, apparel, vestments, garments, attire.
Droop - pine, sink, fade, decline, languish.
Dumb - mute, still, silent, inarticulate.
Durable - lasting, constant, permanent, continuing.
Dutiful - submissive, obedient, respectful.
Dwelling - home, house, abode, habitation, residence, domicile.
Eager - earnest, excited, ardent, impetuous, quick, vehement.
Earn - acquire, win, make, gain, obtain.
Ease - rest, quiet, repose, facility, lightness.
Economical - careful, close, saving, frugal, thrifty, sparing.
Ecstasy - happiness, joy, rapture, transport, delight, enthusiasm, elevation.
Edifice - building, fabric, structure.
Efface - destroy, obliterate, erase, expunge, eradicate.
Effect - consequence, result, purpose, event, issue, reality, meaning.
Effects - things, goods, chattels, furniture, movables, property.
Efficient - competent, capable, able, effectual, effective.
Effort - endeavor, essay, attempt, exertion, trial.
Elegant - graceful, lovely, beautiful, handsome.
Eligible - suitable, fit, worthy, capable.
Embarrass - trouble, entangle, puzzle, perplex, distress.
Embellish - ornament, decorate, adorn, illustrate, deck, beautify.
Emblem - symbol, figure, type.
Embrace - hold, clasp, hug, comprehend, comprise.
Emergency - necessity, exigency, casualty.
Emolument - reward, profit, gain, advantage, lucre.
Emotion - feeling, tremor, excitement, agitation.
Employment - occupation, trade, profession, business, avocation.
Empower - enable, delegate, commission, authorize.
Empty - untenanted, vacant, void, evacuated, unfurnished, unfilled.
Enchant - beguile, charm, captivate, bewitch, fascinate, enrapture.
Encomium - eulogy, praise.
Encounter - quarrel, assault, attack, combat, engagement, meeting.
Encourage - cheer, stimulate, animate, incite, sanction, support, countenance, instigate.
Encroach - intrude, trespass, infringe.
End - finish, close, stop, extremity, termination, sequel, consequence, cessation, death, purpose.