Definition of: dull

(dul) adjective
1. Not sharp or keen; having a blunt edge or point.
2. Not acute or intense: dull pain.
3. Not quick, as in thought; sluggish; listless; stupid; lacking in perception, sensibility, or responsiveness.
4. Not brisk or active.
5. Not bright or spirited; wearisome; boring; sad.
6. Lacking luster; cloudy; dim.
7. Of sounds, indistinct; heavily muffled. See synonyms Under BLUNT, FLAT, HEAVY, LIFELESS, NUMB, SAD, SLOW, TEDIOUS.
—v.t. & v.i. To make or become dull. [ME dul. Akin to OE dol foolish.]
—dull′ish adjective
—dul′ly adverb
—dul′ness, dull′ness noun