dull

/ˈdəl/

Middle English dul; akin to Old English dol foolish, Old Irish dall blind

adjective

  1. tedious, uninteresting

  2. lacking sharpness of edge or point

  3. not resonant or ringing

dull lectures

dull blunt obtuse mean not sharp, keen, or acute. dull suggests a lack or loss of keenness, zest, or pungency. blunt suggests an inherent lack of sharpness or quickness of feeling or perception.

verb

  1. to make dull

  2. to become dull

dull a knife's edge

adjective

  1. mentally slow : dim-witted

He tried to teach her how to pronounce his last name with a French twirl, and when her tongue could not master it he accused her of being dull-witted.