| dauntlessness | (noun) resolute courageousness | Synonyms: intrepidity |
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| dawdler | (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: drone, laggard, lagger, poke, trailer |
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| dazzle | (noun) brightness enough to blind partially and temporarily | - |
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| dealer | (noun) a firm engaged in trading | - |
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| (noun) a seller of illicit goods | - |
| (noun) the person who distributes the playing cards in a card game | - |
| (noun) someone who purchases and maintains an inventory of goods to be sold | Synonyms: bargainer, monger, trader |
| (noun) the major party to a financial transaction at a stock exchange; buys and sells for his own account | Synonyms: principal |
| dealership | (noun) a business established or operated under an authorization to sell or distribute a company's goods or services in a particular area | Synonyms: franchise |
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| debacle | (noun) a sound defeat | Synonyms: drubbing, slaughter, thrashing, trouncing, walloping, whipping |
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| (noun) a sudden and violent collapse | Synonyms: fiasco |
| (noun) flooding caused by a tumultuous breakup of ice in a river during the spring or summer | - |
| decalescence | (noun) phenomenon that occurs when a metal is being heated and there is a sudden slowing in the rate of temperature increase; slowing is caused by a change in the internal crystal structure of the metal | - |
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| decasyllable | (noun) a verse line having ten syllables | - |
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| deceleration | (noun) the act of decelerating; decreasing the speed | - |
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| (noun) a decrease in rate of change | Synonyms: retardation, slowing |
| (noun) (physics) a rate of decrease in velocity | - |
| decile | (noun) (statistics) any of nine points that divided a distribution of ranked scores into equal intervals where each interval contains one-tenth of the scores | - |
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| deckle | (noun) (paper making) a frame used to form paper pulp into sheets | - |
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| (noun) rough edge left by a deckle on handmade paper or produced artificially on machine-made paper | Synonyms: deckle edge |
| declension | (noun) a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms | - |
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| (noun) a downward slope or bend | Synonyms: declination, decline, declivity, descent, downslope, fall |
| (noun) process of changing to an inferior state | Synonyms: decline in quality, deterioration, worsening |
| (noun) the inflection of nouns and pronouns and adjectives in Indo-European languages | - |
| decolletage | (noun) a low-cut neckline on a woman's dress | - |
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| deductible | (noun) a clause in an insurance policy that relieves the insurer of responsibility to pay the initial loss up to a stated amount | - |
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| (noun) (taxes) an amount that can be deducted (especially for the purposes of calculating income tax) | - |
| defencelessness | (noun) the property of being helpless in the face of attack | Synonyms: defenselessness, unprotectedness |
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| defenselessness | (noun) the property of being helpless in the face of attack | Synonyms: defencelessness, unprotectedness |
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| defile | (noun) a narrow pass (especially one between mountains) | Synonyms: gorge |
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| defilement | (noun) the state of being polluted | Synonyms: befoulment, pollution |
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| defiler | (noun) a person or organization that causes pollution of the environment | Synonyms: polluter |
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| deflection | (noun) a turning aside (of your course or attention or concern) | Synonyms: deflexion, deviation, digression, divagation, diversion |
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| (noun) the property of being bent or deflected | Synonyms: bending, deflexion |
| (noun) the amount by which a propagating wave is bent | Synonyms: deflexion, refraction |
| (noun) the movement of the pointer or pen of a measuring instrument from its zero position | Synonyms: deflexion |
| (noun) a twist or aberration; especially a perverse or abnormal way of judging or acting | Synonyms: warp |
| deflector | (noun) a device intended to turn aside the flow of something (water or air or smoke etc) | - |
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| deflexion | (noun) a turning aside (of your course or attention or concern) | Synonyms: deflection, deviation, digression, divagation, diversion |
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| (noun) the property of being bent or deflected | Synonyms: bending, deflection |
| (noun) the amount by which a propagating wave is bent | Synonyms: deflection, refraction |
| (noun) the movement of the pointer or pen of a measuring instrument from its zero position | Synonyms: deflection |
| delectability | (noun) extreme appetizingness | Synonyms: deliciousness, lusciousness, toothsomeness |
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| delectation | (noun) act of receiving pleasure from something | Synonyms: enjoyment |
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| (noun) a feeling of extreme pleasure or satisfaction | Synonyms: delight |
| delegacy | (noun) the appointment of a delegate | - |
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| (noun) a group of representatives or delegates | Synonyms: commission, delegation, deputation, mission |
| (noun) the state of serving as an official and authorized delegate or agent | Synonyms: agency, representation |
| delegate | (noun) a person appointed or elected to represent others | - |
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| delegating | (noun) authorizing subordinates to make certain decisions | Synonyms: delegation, deputation, relegating, relegation |
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| delegation | (noun) authorizing subordinates to make certain decisions | Synonyms: delegating, deputation, relegating, relegation |
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| (noun) a group of representatives or delegates | Synonyms: commission, delegacy, deputation, mission |
| deletion | (noun) the act of deleting something written or printed | - |
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| (noun) the omission that is made when an editorial change shortens a written passage | Synonyms: cut, excision |
| (noun) (genetics) the loss or absence of one or more nucleotides from a chromosome | - |
| (noun) any process whereby sounds or words are left out of spoken words or phrases | Synonyms: omission |
| deliverable | (noun) something that can be provided as the product of development | - |
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| demoiselle | (noun) small brilliantly colored tropical marine fishes of coral reefs | Synonyms: damselfish |
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| (noun) a young unmarried woman | Synonyms: damoiselle, damosel, damozel, damsel |
| denticle | (noun) small pointed ridge on the exoskeleton of an arthropod | - |
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| deoxynucleotide | (noun) Any nucleotide that contains a deoxy sugar. | - |
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| dependableness | (noun) the quality of being dependable or reliable | Synonyms: dependability, reliability, reliableness |
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| depletion | (noun) the act of decreasing something markedly | - |
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| (noun) the state of being depleted | - |
| dermatosclerosis | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: scleroderma |
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| deshabille | (noun) the state of being carelessly or partially dressed | Synonyms: dishabille |
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| desirableness | (noun) the quality of being worthy of desiring | Synonyms: desirability |
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| (noun) attractiveness to the opposite sex | Synonyms: desirability, oomph, sex appeal |
| despicableness | (noun) unworthiness by virtue of lacking higher values | Synonyms: baseness, contemptibility, despicability, sordidness |
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| despoiler | (noun) someone who takes spoils or plunder (as in war) | Synonyms: freebooter, looter, pillager, plunderer, raider, spoiler |
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| dhole | (noun) fierce wild dog of the forests of central and southeast Asia that hunts in packs | Synonyms: Cuon alpinus |
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| dialect | (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: accent, idiom |
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| dialectic | (noun) any formal system of reasoning that arrives at the truth by the exchange of logical arguments | - |
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| (noun) a contradiction of ideas that serves as the determining factor in their interaction | - |
| dialectician | (noun) a logician skilled in dialectic | - |
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| dialectics | (noun) a rationale for dialectical materialism based on change through the conflict of opposing forces | - |
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| dialectology | (noun) the branch of philology that is devoted to the study of dialects | - |
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| diastole | (noun) the widening of the chambers of the heart between two contractions when the chambers fill with blood | - |
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| dibble | (noun) a wooden hand tool with a pointed end; used to make holes in the ground for planting seeds or bulbs | Synonyms: dibber |
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| dicotyledon | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, exogen, magnoliopsid |
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| diddley | (noun) a small worthless amount | Synonyms: diddly-shit, diddly-squat, diddly, diddlyshit, diddlysquat, doodly-squat, jack, shit, squat |
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| dielectric | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: insulator, nonconductor |
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| dielectrolysis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: cataphoresis, electrophoresis, ionophoresis |
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| digestibleness | (noun) the property of being easy to digest | Synonyms: digestibility |
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| dilemma | (noun) state of uncertainty or perplexity especially as requiring a choice between equally unfavorable options | Synonyms: quandary |
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| dilettante | (noun) an amateur who engages in an activity without serious intentions and who pretends to have knowledge | Synonyms: dabbler, sciolist |
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| dillenia | (noun) any of several evergreen trees or shrubs of the genus Dillenia grown for their foliage and nodding flowers resembling magnolias which are followed by fruit that is used in curries and jellies and preserves | - |
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| dimple | (noun) a small natural hollow in the cheek or chin | - |
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| (noun) any slight depression in a surface | - |
| (noun) a chad that has been punched or dimpled but all four corners are still attached | Synonyms: dimpled chad, pregnant chad |
| dingle | (noun) a small wooded hollow | Synonyms: dell |
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| diplegia | (noun) paralysis of corresponding parts on both sides of the body | - |
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| dipole | (noun) an aerial half a wavelength long consisting of two rods connected to a transmission line at the center | Synonyms: dipole antenna |
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| (noun) a pair of equal and opposite electric charges or magnetic poles separated by a small distance | - |
| dirigible | (noun) a steerable self-propelled aircraft | Synonyms: airship |
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| disabled | (noun) people collectively who are crippled or otherwise physically handicapped | Synonyms: handicapped |
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| disablement | (noun) the condition of being unable to perform as a consequence of physical or mental unfitness | Synonyms: disability, handicap, impairment |
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| disagreeableness | (noun) an ill-tempered and offensive disposition | - |
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| (noun) the quality of being disagreeable and unpleasant | - |
| disciple | (noun) someone who believes and helps to spread the doctrine of another | Synonyms: adherent |
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| discipleship | (noun) the position of disciple | - |
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| disentanglement | (noun) the act of releasing from a snarled or tangled condition | Synonyms: extrication, unsnarling, untangling |
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| disentangler | (noun) a person who removes tangles; someone who takes something out of a tangled state | Synonyms: unraveler, unraveller |
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| disgruntlement | (noun) a feeling of sulky discontent | - |
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| dishabille | (noun) the state of being carelessly or partially dressed | Synonyms: deshabille |
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| dishonorableness | (noun) the quality of not deserving honor or respect | Synonyms: dishonourableness |
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| dishonourableness | (noun) the quality of not deserving honor or respect | Synonyms: dishonorableness |
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| dismantlement | (noun) the act of taking something apart (as a piece of machinery) | Synonyms: disassembly, dismantling |
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| dispensableness | (noun) the quality possessed by something that you can get along without | Synonyms: dispensability |
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| displeasure | (noun) the feeling of being displeased or annoyed or dissatisfied with someone or something | - |
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| disposable | (noun) an item that can be disposed of after it has been used | - |
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| disreputableness | (noun) dishonorableness by virtue of lacking respectability or a good reputation | Synonyms: disreputability, unrespectability |
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| dissembler | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissimulator, hypocrite, phoney, phony, pretender |
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| dissyllable | (noun) a word having two syllables | Synonyms: disyllable |
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| distiller | (noun) someone who distills alcoholic liquors | - |
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| distillery | (noun) a plant and works where alcoholic drinks are made by distillation | Synonyms: still |
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| disyllable | (noun) a word having two syllables | Synonyms: dissyllable |
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| doddle | (noun) an easy task | - |
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| dogleg | (noun) a golf hole with a sharp angle in the fairway | - |
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| (noun) angle that resembles the hind leg of a dog | - |
| dogsled | (noun) a sled pulled by dogs | Synonyms: dog sled, dog sleigh |
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| dole | (noun) money received from the state | Synonyms: pogey, pogy |
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| (noun) a share of money or food or clothing that has been charitably given | - |
| dolefulness | (noun) sadness caused by grief or affliction | - |
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| domicile | (noun) housing that someone is living in | Synonyms: abode, dwelling, dwelling house, habitation, home |
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| (noun) (law) the residence where you have your permanent home or principal establishment and to where, whenever you are absent, you intend to return; every person is compelled to have one and only one domicile at a time | Synonyms: legal residence |
| dongle | (noun) (computer science) an electronic device that must be attached to a computer in order for it to use protected software | - |
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| doodle | (noun) an aimless drawing | Synonyms: scrabble, scribble |
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| doodlebug | (noun) the larva of any of several insects | Synonyms: ant lion, antlion |
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| (noun) a small jet-propelled winged missile that carries a bomb | Synonyms: buzz bomb, flying bomb, robot bomb, V-1 |
| (noun) a small motor vehicle | - |
| doorhandle | (noun) a knob used to release the catch when opening a door (often called `doorhandle' in Great Britain) | Synonyms: doorknob |
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| dorbeetle | (noun) Old World dung beetle that flies with a droning sound | - |
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| dorsiflexion | (noun) the act of bending backward (of the body or a body part) | - |
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| dottle | (noun) the residue of partially burnt tobacco left caked in the bowl of a pipe after smoking | - |
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| double | (noun) a base hit on which the batter stops safely at second base | Synonyms: two-bagger, two-base hit, two-baser |
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| (noun) raising the stakes in a card game by a factor of 2 | Synonyms: doubling |
| (noun) a quantity that is twice as great as another | - |
| (noun) someone who closely resembles a famous person (especially an actor) | Synonyms: image, look-alike |
| (noun) a stand-in for movie stars to perform dangerous stunts | - |
| doubleheader | (noun) two games instead of one (especially in baseball when the same two teams play two games on the same day) | Synonyms: double feature, twin bill |
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| doubler | (noun) an electronic device that doubles the voltage or the frequency of an input signal | - |
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| doubles | (noun) tennis played with two players on each side | - |
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| (noun) badminton played with two players on each side | - |
| doublespeak | (noun) any language that pretends to communicate but actually does not | - |
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