| 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 |
| dualistic | (adjective) of or relating to the philosophical doctrine of dualism | Synonyms: Manichaean |
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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 | - |
| dubitable | (adjective) open to doubt or suspicion | Synonyms: doubtful, dubious, in question |
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| 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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| ductile | (adjective) capable of being shaped or bent or drawn out | Synonyms: malleable, pliable, pliant, tensile, tractile |
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| (adjective) easily influenced | Synonyms: malleable |
| ductless | (adjective) not having a duct | - |
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| dud | (adjective) failing to detonate; especially not charged with an active explosive | - |
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| due | (adjective) owed and payable immediately or on demand | - |
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| (adjective) suitable to or expected in the circumstances | - |
| (adjective) capable of being assigned or credited to | Synonyms: ascribable, imputable, referable |
| (adjective) scheduled to arrive | - |
| dulcet | (adjective) pleasing to the ear | Synonyms: honeyed, mellifluous, mellisonant, sweet |
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| (adjective) extremely pleasant in a gentle way | - |
| 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 |
| dulled | (adjective) deprived of color | Synonyms: greyed |
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| (adjective) made dull or blunt | Synonyms: blunted |
| (adjective) having lost or been caused to lose interest because of overexposure | Synonyms: benumbed |
| dumb | (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dull, obtuse, slow |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: mute, silent |
| (adjective) temporarily incapable of speaking | Synonyms: speechless |
| (adjective) lacking the power of human speech | - |
| dumbfounded | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied, thunderstruck |
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| dumbfounding | (adjective) bewildering or striking dumb with wonder | Synonyms: astounding, dumfounding |
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| dumbstricken | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstruck, dumfounded, flabbergasted, stupefied, thunderstruck |
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| dumbstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumfounded, flabbergasted, stupefied, thunderstruck |
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| dumfounded | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, flabbergasted, stupefied, thunderstruck |
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| dumfounding | (adjective) bewildering or striking dumb with wonder | Synonyms: astounding, dumbfounding |
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| dummy | (adjective) having the appearance of being real but lacking capacity to function | - |
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| dumpy | (adjective) resembling a garbage dump | - |
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| (adjective) short and plump | Synonyms: podgy, pudgy, roly-poly, tubby |
| (adjective) short and thick; as e.g. having short legs and heavy musculature | Synonyms: chunky, low-set, squat, squatty, stumpy |
| dun | (adjective) of a dull greyish brown to brownish grey color | - |
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| duncical | (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncish, fatheaded, loggerheaded, thick-skulled, thick, thickheaded, wooden-headed |
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| duncish | (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncical, 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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| duple | (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: double, dual |
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| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| duplicable | (adjective) capable of being duplicated | Synonyms: duplicatable |
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| duplicatable | (adjective) capable of being duplicated | Synonyms: duplicable |
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| duplicate | (adjective) being two identical | Synonyms: matching, twin, twinned |
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| (adjective) identically copied from an original | - |
| 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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| durable | (adjective) very long lasting | Synonyms: indestructible, perdurable, undestroyable |
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| (adjective) existing for a long time | Synonyms: lasting, long-lasting, long-lived |
| (adjective) capable of withstanding wear and tear and decay | Synonyms: long-wearing |
| dural | (adjective) of or relating to the dura mater | - |
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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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| dutiable | (adjective) subject to import tax | - |
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| dutiful | (adjective) willingly obedient out of a sense of duty and respect | Synonyms: duteous |
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