Origin: 1200–50; ME; akin to OE
dol foolish, stupid; c. G
toll
Related forms: dullness, dulness, noun
dully, adverb
Synonyms:
1. Dull, blunt refer to the edge or point of an instrument, tool, or the like. Dull implies a lack or a loss of keenness or sharpness: a dull razor or saw. Blunt may mean the same or may refer to an edge or point not intended to be keen or sharp: a blunt or stub pen; a blunt foil. 2. boring, tiresome, dreary, vapid. 3. apathetic, torpid, inactive, inert. 7. unimaginative, unintelligent, stolid. Dull, blunted, slow, stupid are applied to mental qualities. Dull implies obtuseness, lack of imagination: a dull child. Blunted implies loss of original keenness of intelligence through disease, sad experience, or the like: blunted faculties. Slow applies to a sluggish intellect: a slow mind. Stupid implies slowness of mental processes, but also lack of intelligence, wisdom, prudence, etc.: a stupid person. 10. blunt, deaden, benumb; depress, dishearten, discourage.
Antonyms:
1. sharp, keen. 2. interesting. 7. bright.
[duhl] 
adjective, -er, -est, verb