| 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 |
| 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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