What does it mean to be dull

dull

dull adj. 'without point, not sharp', ahd.dumph (Hs. 12th cent.), mhd.dull, (md.) dull 'mutilated, truncated, imperfect, bad', mnd. dull, mnl.nl. stomp. The adjective (westgerm. * Stumpa-), which is only used in German and Nl. to the variant given under ↗stampfen (sd) ie. * stemb- the root mentioned under ↗Stab (sd). The oldest meaning is "mutilated, shortened". In mathematics obtuse angles (around 1400), i.e. H. ‘Not acute, but wider, wide angle’ (probably translation from Latin angulus obtūsus). blunt vb ‘Trim, trim, dull’, dull. to dull vb ‘Trim, blunt or become’ (16th century), transferred ‘weaken, insensitive, render or become numb’ (end of 18th century). Dullness f. ‘State of dullness’, dullness of late mothers, dullness; mainly transferred (since the end of the 18th century) to the physical and mental human attitude of insensitivity, indolence, inability to react ’. dull adj. ‘weak-minded, stupid’ (15th century; cf. mhd.stumpfer sin), ‘mentally uninterested and sluggish, callous’ (18th century); from this regressed dullness with ‘mental weakness’ (end of 18th century), then especially ‘mental indolence, indifference’, also ‘boredom, monotony’.