| dipterous | (adjective) of or relating to or belonging to the Diptera | - |
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| disabused | (adjective) freed of a mistaken or misguided notion | Synonyms: undeceived |
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| disadvantageous | (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: unfavorable, unfavourable |
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| disastrous | (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, fatal, fateful |
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| discomycetous | (adjective) relating to or characteristic of fungi of the subclass Discomycetes | - |
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| discontinuous | (adjective) not continuing without interruption in time or space | Synonyms: noncontinuous |
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| (adjective) of a function or curve; possessing one or more discontinuities | - |
| discourteous | (adjective) showing no courtesy; rude | - |
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| (adjective) lacking social graces | Synonyms: ungracious |
| disgusted | (adjective) having a strong distaste from surfeit | Synonyms: fed up, sick, sick of, tired of |
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| 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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| disgusting | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, distasteful, foul, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| disharmonious | (adjective) lacking in harmony | Synonyms: discordant, dissonant, inharmonic |
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| disillusioned | (adjective) freed from illusion | - |
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| disillusioning | (adjective) freeing from illusion or false belief | Synonyms: disenchanting |
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| disingenuous | (adjective) not straightforward or candid; giving a false appearance of frankness | Synonyms: artful |
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| disputatious | (adjective) inclined or showing an inclination to dispute or disagree, even to engage in law suits | Synonyms: combative, contentious, disputative, litigious |
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| dissentious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: divisive, factious |
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| distrustful | (adjective) having or showing distrust | - |
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| disused | (adjective) no longer in use | Synonyms: obsolete |
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| dizygous | (adjective) derived from two separately fertilized eggs | Synonyms: dizygotic |
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| dolorous | (adjective) showing sorrow | Synonyms: dolourous, lachrymose, tearful, weeping |
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| dolourous | (adjective) showing sorrow | Synonyms: dolorous, lachrymose, tearful, weeping |
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| drupaceous | (adjective) of or related to a drupe | - |
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| dubious | (adjective) open to doubt or suspicion | Synonyms: doubtful, dubitable, in question |
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| (adjective) fraught with uncertainty or doubt | Synonyms: doubtful |
| (adjective) not convinced | - |
| duplicitous | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, deceitful, double-dealing, double-faced, double-tongued, Janus-faced, two-faced |
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| dusky | (adjective) naturally having skin of a dark color | Synonyms: dark-skinned, swart, swarthy |
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| (adjective) lighted by or as if by twilight | Synonyms: twilight, twilit |
| dustlike | (adjective) as fine and powdery as dust | - |
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| dusty | (adjective) covered with a layer of dust | Synonyms: dust-covered |
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| (adjective) lacking originality or spontaneity; no longer new | Synonyms: cold, moth-eaten, stale |
| duteous | (adjective) willingly obedient out of a sense of duty and respect | Synonyms: dutiful |
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| edacious | (adjective) devouring or craving food in great quantities | Synonyms: esurient, rapacious, ravening, ravenous, voracious, wolfish |
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| edematous | (adjective) swollen with an excessive accumulation of fluid | Synonyms: dropsical |
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| edentulous | (adjective) having lost teeth | - |
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| efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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| (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
| effusive | (adjective) extravagantly demonstrative | Synonyms: gushing, gushy |
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| (adjective) uttered with unrestrained enthusiasm | Synonyms: burbling, burbly, gushing |
| egregious | (adjective) conspicuously and outrageously bad or reprehensible | Synonyms: crying, flagrant, glaring, gross, rank |
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| elusive | (adjective) skillful at eluding capture | - |
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| (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, knotty, problematic, problematical, tough |
| (adjective) difficult to detect or grasp by the mind or analyze | Synonyms: subtle |
| (adjective) difficult to describe | - |
| emeritus | (adjective) honorably retired from assigned duties and retaining your title along with the additional title `emeritus' as in `professor emeritus' | - |
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| emphysematous | (adjective) relating to or resembling or being emphysema | - |
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| emulous | (adjective) characterized by or arising from emulation or imitation | - |
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| (adjective) eager to surpass others | Synonyms: rivalrous |
| encrusted | (adjective) having a hardened crust as a covering | Synonyms: crusted, crustlike, crusty |
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| endogamous | (adjective) pertaining to or characterized by the custom of marrying only within the limits of a clan or tribe | Synonyms: endogamic |
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| (adjective) characterized by or fit for fertilization by pollen from another flower of the same kind | Synonyms: endogamic |
| endogenous | (adjective) derived or originating internally | Synonyms: endogenic |
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| (adjective) of or resembling an endogen | - |
| endovenous | (adjective) within or by means of a vein | Synonyms: intravenous |
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| enormous | (adjective) extraordinarily large in size or extent or amount or power or degree | Synonyms: tremendous |
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| enthusiastic | (adjective) having or showing great excitement and interest | - |
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| entomophilous | (adjective) of flowering plants (especially orchids etc) that are pollinated by insects | - |
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| envious | (adjective) showing extreme cupidity; painfully desirous of another's advantages | Synonyms: covetous, jealous |
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| eponymous | (adjective) being or relating to or bearing the name of an eponym | Synonyms: eponymic |
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| equanimous | (adjective) in full control of your faculties | Synonyms: collected, poised, self-collected, self-contained, self-possessed |
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| erogenous | (adjective) sensitive to sexual stimulation | - |
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| erroneous | (adjective) containing or characterized by error | - |
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| erythematous | (adjective) relating to or characterized by erythema | - |
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| estrous | (adjective) (of lower mammals) showing or in a state of estrus; in heat | - |
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| euphonious | (adjective) having a pleasant sound | Synonyms: euphonous |
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| (adjective) (of speech or dialect) pleasing in sound; not harsh or strident | - |
| euphonous | (adjective) having a pleasant sound | Synonyms: euphonious |
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| eusporangiate | (adjective) (of ferns) having sporangia that arise from a group of epidermal cells | - |
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| exclusive | (adjective) excluding much or all; especially all but a particular group or minority | - |
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| (adjective) not divided among or brought to bear on more than one object or objective | Synonyms: single, undivided |
| (adjective) not divided or shared with others | Synonyms: sole |
| excusable | (adjective) capable of being overlooked | - |
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| (adjective) easily excused or forgiven | Synonyms: forgivable, venial |
| excusatory | (adjective) offering or expressing apology | Synonyms: apologetic |
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| excused | (adjective) granted exemption | - |
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| exhausted | (adjective) depleted of energy, force, or strength | Synonyms: spent |
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| (adjective) drained physically | - |
| (adjective) drained of energy or effectiveness; extremely tired; completely exhausted | Synonyms: dog-tired, fagged, fatigued, gone, played out, spent, washed-out, worn-out, worn out |
| exhaustible | (adjective) capable of being used up | - |
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| (adjective) capable of being used up; capable of being exhausted | - |
| exhausting | (adjective) having a debilitating effect | Synonyms: draining |
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| (adjective) producing exhaustion | Synonyms: tiring, wearing, wearying |
| exhaustive | (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: thorough, thoroughgoing |
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| exiguous | (adjective) extremely scanty | - |
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| exogamous | (adjective) pertaining to or characterized by the custom of marrying only outside the limits of a clan or tribe | Synonyms: exogamic |
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| (adjective) characterized by or fit for fertilization by a flower that is not closely related | Synonyms: exogamic |
| exogenous | (adjective) derived or originating externally | Synonyms: exogenic |
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| expeditious | (adjective) marked by speed and efficiency | - |
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| exsanguinous | (adjective) destitute of blood or apparently so | Synonyms: bloodless, exsanguine |
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| extemporaneous | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporary, extempore, impromptu, off-the-cuff, offhand, offhanded, unrehearsed |
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| extraneous | (adjective) not belonging to that in which it is contained; introduced from an outside source | Synonyms: foreign |
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| (adjective) not pertinent to the matter under consideration | Synonyms: immaterial, impertinent, orthogonal |
| (adjective) coming from the outside | Synonyms: external, outside |
| (adjective) not essential | - |
| extrusive | (adjective) of rock material; forced out while molten through cracks in the earth's surface | - |
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| fabulous | (adjective) barely credible | - |
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| (adjective) extremely pleasing | Synonyms: fab |
| (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: mythic, mythical, mythologic, mythological |
| facetious | (adjective) cleverly amusing in tone | Synonyms: bantering, tongue-in-cheek |
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| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| fallacious | (adjective) involving deception | Synonyms: deceitful, fraudulent |
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| (adjective) based on an incorrect or misleading notion or information | - |
| (adjective) containing or based on a fallacy | Synonyms: unsound |
| famous | (adjective) widely known and esteemed | Synonyms: celebrated, famed, far-famed, illustrious, notable, noted, renowned |
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| fantabulous | (adjective) very good; of the highest quality | Synonyms: excellent, first-class, mean, ripping, splendid |
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| farinaceous | (adjective) composed of or covered with particles resembling meal in texture or consistency | Synonyms: coarse-grained, grainy, granular, granulose, gritty, mealy |
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| (adjective) resembling starch | Synonyms: amylaceous, amyloid, amyloidal, starchlike |
| fastidious | (adjective) giving careful attention to detail; hard to please; excessively concerned with cleanliness | - |
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| (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: exacting |
| fatuous | (adjective) extremely silly or stupid | Synonyms: asinine, inane |
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| felicitous | (adjective) exhibiting an agreeably appropriate manner or style | - |
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| (adjective) marked by good fortune | Synonyms: happy |
| felonious | (adjective) involving or being or having the nature of a crime | Synonyms: criminal |
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| ferocious | (adjective) marked by extreme and violent energy | Synonyms: fierce, furious, savage |
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| ferrous | (adjective) of or relating to or containing iron | Synonyms: ferric |
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| feverous | (adjective) having or affected by a fever | Synonyms: feverish |
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| fibrinous | (adjective) characterized by the presence of fibrin | - |
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| fibrocartilaginous | (adjective) of or relating to fibrocartilage | - |
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| fibrous | (adjective) (of meat) full of sinews; especially impossible to chew | Synonyms: sinewy, stringy, unchewable |
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| (adjective) having or resembling fibers especially fibers used in making cordage such as those of jute | Synonyms: hempen |
| fictitious | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictive, pretended, put on, sham |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictional |
| filamentous | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filiform, threadlike, thready |
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| fissiparous | (adjective) reproducing by fission | - |
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| (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: breakaway, separatist |
| fistulous | (adjective) of or pertaining to or resembling a fistula | - |
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| (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulate |
| flagitious | (adjective) shockingly brutal or cruel | Synonyms: atrocious, grievous, monstrous |
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| (adjective) extremely wicked, deeply criminal | Synonyms: heinous |
| flavorous | (adjective) full of flavor | Synonyms: flavorful, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourous | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavoursome, sapid, saporous |
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| flexuous | (adjective) having turns or windings | - |
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| flirtatious | (adjective) like a coquette | Synonyms: coquettish |
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| flush | (adjective) of a surface exactly even with an adjoining one, forming the same plane | - |
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| (adjective) having an abundant supply of money or possessions of value | Synonyms: affluent, loaded, moneyed, substantial, wealthy |
| flushed | (adjective) (especially of the face) reddened or suffused with or as if with blood from emotion or exertion | Synonyms: crimson, red-faced, red, reddened |
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| (adjective) having the pinkish flush of health | Synonyms: rose-cheeked, rosy-cheeked, rosy |