| 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 |
| (verb) become dull or lusterless in appearance; lose shine or brightness | - |
| (verb) make less lively or vigorous | - |
| (verb) become less interesting or attractive | Synonyms: pall |
| (verb) make dull in appearance | - |
| (verb) make dull or blunt | Synonyms: blunt |
| (verb) deaden (a sound or noise), especially by wrapping | Synonyms: damp, dampen, muffle, mute, tone down |
| (verb) make numb or insensitive | Synonyms: benumb, blunt, numb |
| dullard | (noun) a person who evokes boredom | Synonyms: bore |
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| (noun) a person who is not very bright | Synonyms: dolt, pillock, poor fish, pudden-head, pudding head, stupe, stupid, stupid person |
| 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 |
| dullness | (noun) lack of sensibility | - |
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| (noun) without sharpness or clearness of edge or point | Synonyms: bluntness |
| (noun) the quality of lacking interestingness | - |
| (noun) a lack of visual brightness | - |
| (noun) the quality of being slow to understand | Synonyms: obtuseness |
| dully | (adverb) without liveliness | - |
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| (adverb) without luster or shine | - |
| medulla | (noun) the inner part of an organ or structure in plant or animal | - |
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| (noun) lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata) | Synonyms: bulb, medulla oblongata |
| (noun) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers | Synonyms: myelin, myeline |
| medullary | (adjective) of or relating to the medulla of any body part | - |
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| (adjective) containing or consisting of or resembling bone marrow | - |
| (adjective) of or relating to the medulla oblongata | - |
| medullated | (adjective) (of neurons) covered with a layer of myelin | Synonyms: myelinated |
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