adj. dull·er, dull·est
a. Arousing little interest; lacking liveliness; boring: a dull movie.
b. Not brisk or rapid; sluggish: Business has been dull.
2. Not having a sharp edge or point; blunt: a dull knife.
a. Not intensely or keenly felt: a dull ache.
b. Not bright, vivid, or shiny: a dull brown; a glaze with a dull finish.
c. Cloudy or overcast: a dull sky.
d. Not clear or resonant: a dull thud.
4. Intellectually weak or obtuse; stupid.
5. Lacking responsiveness or alertness; insensitive: half-asleep and dull to the noises in the next room.
6. Dispirited; depressed: a dull mood.
tr. & intr.v. dulled, dull·ing, dulls
To make or become dull.
[Middle English dul; akin to Old English dol.]
dullness, dulness n.
Synonyms: dull, colorless, drab1, humdrum, lackluster, pedestrian, stodgy, uninspired
These adjectives mean lacking in liveliness, charm, or surprise: a dull, uninteresting performance; a colorless and unimaginative person; a drab and boring job; a humdrum conversation; a lackluster life; a pedestrian movie plot; a stodgy dinner party; an uninspired lecture.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.
American Heritage Dictionary Products
The American Heritage Dictionary, 5th Edition
The American Heritage Dictionary of Idioms
The American Heritage Roget's Thesaurus
Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
The American Heritage Essential Student Thesaurus