| diluvial | (adjective) of or connected with a deluge | Synonyms: diluvian |
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| dimensional | (adjective) of or relating to dimensions | - |
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| (adjective) having dimension--the quality or character or stature proper to a person | - |
| dioestrual | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrous, diestrual, dioestrous |
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| diplomatical | (adjective) using or marked by tact in dealing with sensitive matters or people | Synonyms: diplomatic |
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| directional | (adjective) relating to or indicating directions in space | - |
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| (adjective) relating to direction toward a (nonspatial) goal | - |
| (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directing, directive, guiding |
| direful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| disciplinal | (adjective) designed to promote discipline | Synonyms: corrective, disciplinary |
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| discoidal | (adjective) having a flat circular shape | Synonyms: disc-shaped, disclike, discoid, disk-shaped, disklike |
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| discretional | (adjective) having or using the ability to act or decide according to your own discretion or judgment | Synonyms: discretionary |
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| disdainful | (adjective) expressing extreme contempt | Synonyms: contemptuous, insulting, scornful |
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| (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: haughty, imperious, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
| disgraceful | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, ignominious, inglorious, opprobrious, shameful |
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| (adjective) giving offense to moral sensibilities and injurious to reputation | Synonyms: scandalous, shameful, shocking |
| disgustful | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgusting, distasteful, foul, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| disloyal | (adjective) deserting your allegiance or duty to leader or cause or principle | - |
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| (adjective) showing lack of love for your country | Synonyms: unpatriotic |
| dismal | (adjective) causing dejection | Synonyms: blue, dark, dingy, disconsolate, drab, drear, dreary, gloomy, grim, sorry |
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| disproportional | (adjective) out of proportion | Synonyms: disproportionate |
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| disrespectful | (adjective) exhibiting lack of respect; rude and discourteous | - |
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| (adjective) neither feeling nor showing respect | Synonyms: aweless, awless |
| distal | (adjective) situated farthest from point of attachment or origin, as of a limb or bone | - |
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| (adjective) directed away from the midline or mesial plane of the body | - |
| distasteful | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, foul, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| (adjective) not pleasing in odor or taste | Synonyms: unsavory, unsavoury |
| distressful | (adjective) causing distress or worry or anxiety | Synonyms: distressing, disturbing, perturbing, troubling, worrisome, worrying |
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| distributional | (adjective) of or relating to spatial distribution | - |
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| distrustful | (adjective) having or showing distrust | - |
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| diurnal | (adjective) of or belonging to or active during the day | - |
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| (adjective) having a daily cycle or occurring every day | - |
| divisional | (adjective) of or relating to a military division | - |
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| (adjective) serving to divide or marking a division | - |
| (adjective) constituting a division or an aliquot part of the basic monetary unit | Synonyms: fractional |
| doctoral | (adjective) of or relating to a doctor or doctorate | Synonyms: doctorial |
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| doctorial | (adjective) of or relating to a doctor or doctorate | Synonyms: doctoral |
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| doctrinal | (adjective) relating to or involving or preoccupied with doctrine | - |
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| documental | (adjective) relating to or consisting of or derived from documents | Synonyms: documentary |
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| dogmatical | (adjective) characterized by assertion of unproved or unprovable principles | Synonyms: dogmatic |
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| doleful | (adjective) filled with or evoking sadness | Synonyms: mournful |
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| dolichocranial | (adjective) having a relatively long head with a cephalic index of under 75 | Synonyms: dolichocephalic, dolichocranic |
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| dominical | (adjective) of or relating to Sunday as the Lord's Day | - |
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| (adjective) of or relating to or coming from Jesus Christ | - |
| dorsal | (adjective) belonging to or on or near the back or upper surface of an animal or organ or part | - |
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| (adjective) facing away from the axis of an organ or organism | Synonyms: abaxial |
| dorsoventral | (adjective) extending from the back to the belly | - |
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| doubtful | (adjective) open to doubt or suspicion | Synonyms: dubious, dubitable, in question |
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| (adjective) fraught with uncertainty or doubt | Synonyms: dubious |
| (adjective) unsettled in mind or opinion | Synonyms: tentative |
| downhill | (adjective) sloping down rather steeply | Synonyms: declivitous, downward-sloping |
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| dramaturgical | (adjective) relating to the technical aspects of drama | Synonyms: dramaturgic |
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| dreadful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, atrocious, awful, painful, terrible, unspeakable |
| (adjective) extremely disagreeable and unpleasant | - |
| droll | (adjective) comical in an odd or whimsical manner | - |
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| dropsical | (adjective) swollen with an excessive accumulation of fluid | Synonyms: edematous |
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| dual | (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: double, duple |
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| (adjective) a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural) | - |
| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: double, three-fold, threefold, treble, two-fold, twofold |
| ducal | (adjective) of or belonging to or suitable for a duke | - |
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| duckbill | (adjective) having a beak resembling that of a duck | Synonyms: duck-billed |
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| dull | (adjective) not having a sharp edge or point | - |
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| (adjective) emitting or reflecting very little light | - |
| (adjective) lacking in liveliness or animation | - |
| (adjective) not keenly felt | - |
| (adjective) darkened with overcast | Synonyms: leaden |
| (adjective) (of business) not active or brisk | Synonyms: slow, sluggish |
| (adjective) blunted in responsiveness or sensibility | - |
| (adjective) being or made softer or less loud or clear | Synonyms: muffled, muted, softened |
| (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dumb, obtuse, slow |
| (adjective) not clear and resonant; sounding as if striking with or against something relatively soft | Synonyms: thudding |
| (adjective) (of color) very low in saturation; highly diluted | - |
| (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, deadening, ho-hum, irksome, slow, tedious, tiresome, wearisome |
| duncical | (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncish, fatheaded, loggerheaded, thick-skulled, thick, thickheaded, wooden-headed |
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| duodecimal | (adjective) based on twelve | - |
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| duodenal | (adjective) in or relating to the duodenum | - |
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| dural | (adjective) of or relating to the dura mater | - |
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| dutiful | (adjective) willingly obedient out of a sense of duty and respect | Synonyms: duteous |
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| dynamical | (adjective) characterized by action or forcefulness or force of personality | Synonyms: dynamic |
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| dysfunctional | (adjective) impaired in function; especially of a bodily system or organ | - |
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| (adjective) (of a trait or condition) failing to serve an adjustive purpose | Synonyms: nonadaptive |
| dyspneal | (adjective) not breathing or able to breathe except with difficulty | Synonyms: breathless, dyspneic, dyspnoeal, dyspnoeic |
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| dyspnoeal | (adjective) not breathing or able to breathe except with difficulty | Synonyms: breathless, dyspneal, dyspneic, dyspnoeic |
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| ecclesiastical | (adjective) of or associated with a church (especially a Christian Church) | Synonyms: ecclesiastic |
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| ecological | (adjective) of or relating to the science of ecology | Synonyms: bionomic, bionomical, ecologic |
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| (adjective) characterized by the interdependence of living organisms in an environment | Synonyms: ecologic |
| economical | (adjective) of or relating to an economy, the system of production and management of material wealth | Synonyms: economic |
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| (adjective) using the minimum of time or resources necessary for effectiveness | Synonyms: economic |
| (adjective) avoiding waste | Synonyms: frugal, scotch, sparing, stinting |
| ectodermal | (adjective) of or relating to the ectoderm | Synonyms: ectodermic |
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| ecumenical | (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, general, oecumenical, universal, world-wide, worldwide |
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| (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, oecumenic, oecumenical |
| edental | (adjective) having few if any teeth | Synonyms: edentate, edentulate |
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| editorial | (adjective) of or relating to an article stating opinions or giving perspectives | - |
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| (adjective) relating to or characteristic of an editor | - |
| educational | (adjective) relating to the process of education | - |
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| (adjective) providing knowledge | - |
| effectual | (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, efficacious |
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| (adjective) having legal efficacy or force | Synonyms: legal, sound |
| effortful | (adjective) requiring great physical effort | - |
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| egoistical | (adjective) concerned chiefly or only with yourself and your advantage to the exclusion of others | Synonyms: egocentric, egoistic, self-centered, self-centred, self-seeking, self-serving, selfish |
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| egotistical | (adjective) characteristic of false pride; having an exaggerated sense of self-importance | Synonyms: conceited, egotistic, self-conceited, swollen-headed, swollen, vain |
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| (adjective) characteristic of those having an inflated idea of their own importance | Synonyms: egotistic, narcissistic, self-loving |
| electoral | (adjective) of or relating to elections | - |
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| (adjective) relating to or composed of electors | - |
| electrical | (adjective) relating to or concerned with electricity | - |
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| (adjective) using or providing or producing or transmitting or operated by electricity | Synonyms: electric |
| electrochemical | (adjective) of or involving electrochemistry | - |
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| electromechanical | (adjective) of or relating to or involving an electrically operated mechanical device | - |
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| electroneutral | (adjective) having no net electric charge | Synonyms: neutral |
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| elemental | (adjective) relating to or being an element | - |
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| (adjective) relating to severe atmospheric conditions | - |
| (adjective) of or being the essential or basic part | Synonyms: basal, elementary, primary |
| ellipsoidal | (adjective) having the nature or shape of an ellipsoid | Synonyms: ellipsoid, spheroidal |
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| elliptical | (adjective) characterized by extreme economy of expression or omission of superfluous elements | Synonyms: elliptic |
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| (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, oval-shaped, oval, ovate, oviform, ovoid, prolate |
| emblematical | (adjective) serving as a visible symbol for something abstract | Synonyms: emblematic, symbolic, symbolical |
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| embryonal | (adjective) of an organism prior to birth or hatching | Synonyms: embryologic, embryonic |
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| emotional | (adjective) of more than usual emotion | - |
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| (adjective) determined or actuated by emotion rather than reason | - |
| (adjective) of or pertaining to emotion | - |
| (adjective) (of persons) excessively affected by emotion | Synonyms: aroused, excited, worked up |
| empirical | (adjective) derived from experiment and observation rather than theory | Synonyms: empiric |
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| (adjective) relying on medical quackery | Synonyms: empiric |
| empyreal | (adjective) of or relating to the sky or heavens | Synonyms: empyrean |
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| (adjective) inspiring awe | Synonyms: empyrean, sublime |
| encyclical | (adjective) intended for wide distribution | - |
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| endemical | (adjective) of or relating to a disease (or anything resembling a disease) constantly present to greater or lesser extent in a particular locality | Synonyms: endemic |
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| endocrinal | (adjective) of or belonging to endocrine glands or their secretions | Synonyms: endocrine |
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| endometrial | (adjective) of or relating to the endometrium | - |
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| endothelial | (adjective) of or relating to or located in the endothelium | - |
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| endothermal | (adjective) (of a chemical reaction or compound) occurring or formed with absorption of heat | Synonyms: endothermic, heat-absorbing |
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| enigmatical | (adjective) not clear to the understanding | Synonyms: enigmatic, puzzling |
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| enteral | (adjective) of or relating to the enteron | Synonyms: enteric |
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| (adjective) of or relating to or inside the intestines | Synonyms: enteric, intestinal |
| entomological | (adjective) of or relating to the biological science of entomology | Synonyms: entomologic |
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| entrepreneurial | (adjective) of or relating to an entrepreneur | - |
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| (adjective) willing to take risks in order to make a profit | - |
| environmental | (adjective) concerned with the ecological effects of altering the environment | - |
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| (adjective) of or relating to the external conditions or surroundings | - |
| eparchial | (adjective) of or relating to an eparchy | - |
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| ephemeral | (adjective) lasting a very short time | Synonyms: fugacious, passing, short-lived, transient, transitory |
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| epical | (adjective) constituting or having to do with or suggestive of a literary epic | Synonyms: epic |
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| epicarpal | (adjective) of or relating to the epicarp | - |
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| epicyclical | (adjective) of or relating to an epicycle | Synonyms: epicyclic |
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| epideictical | (adjective) designed primarily for rhetorical display | Synonyms: epideictic |
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| epidemiological | (adjective) of or relating to epidemiology | Synonyms: epidemiologic |
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| epidermal | (adjective) of or relating to a cuticle or cuticula | Synonyms: cuticular, dermal, epidermic |
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| epidural | (adjective) on or outside the dura mater | Synonyms: extradural |
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| epiphyseal | (adjective) relating to the epiphysis of a bone | Synonyms: epiphysial |
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| epiphysial | (adjective) relating to the epiphysis of a bone | Synonyms: epiphyseal |
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| episcopal | (adjective) denoting or governed by or relating to a bishop or bishops | Synonyms: pontifical |
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