adjective, duller, dullest.
not sharp; blunt: a dull knife.
causing boredom; tedious; uninteresting: a dull sermon.
not lively or spirited; listless.
not bright, intense, or clear; dim: a dull day; a dull sound.
having very little depth of color; lacking in richness or intensity of color.
slow in motion or action; not brisk; sluggish: a dull day in the stock market.
mentally slow; lacking brightness of mind; somewhat stupid; obtuse.
lacking keenness of perception in the senses or feelings; insensible; unfeeling.
not intense or acute: a dull pain.
verb (used with object), verb (used without object)
to make or become dull.

1200–50; Middle English; akin to Old English dol foolish, stupid; cognate with German toll

dullness, dulness, noun
dully, adverb
undulled, adjective

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.

1. sharp, keen. 2. interesting. 7. bright.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dull (dʌl)
1.  slow to think or understand; stupid
2.  lacking in interest
3.  lacking in perception or the ability to respond; insensitive
4.  lacking sharpness; blunt
5.  not acute, intense, or piercing
6.  (of weather) not bright or clear; cloudy
7.  not active, busy, or brisk
8.  lacking in spirit or animation; listless
9.  (of colour) lacking brilliance or brightness; sombre
10.  not loud or clear; muffled
11.  med (of sound elicited by percussion, esp of the chest) not resonant
12.  to make or become dull
[Old English dol; related to Old Norse dul conceit, Old High German tol foolish, Greek tholeros confused]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

M.E., but rare before mid-14c., apparently from O.E. dol "dull-witted, foolish," or from M.L.G. dul "slow-witted," both from P.Gmc. *dulaz. Of color from early 15c.; of pain or other sensations from 1725. Sense of "boring" first recorded 1580s. Dullsville, slang for "town where nothing happens," attested
from 1960.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dull (dŭl)
adj. dull·er, dull·est

  1. Lacking responsiveness or alertness; insensitive.

  2. Not intensely or keenly felt, as in pain.

dull'ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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