Dictionary![]() ![]() dullPronunciation: (dul), [key] —adj., -er, -est, —v. —adj. 1. not sharp; blunt: a dull knife. 2. causing boredom; tedious; uninteresting: a dull sermon. 3. not lively or spirited; listless. 4. not bright, intense, or clear; dim: a dull day; a dull sound. 5. having very little depth of color; lacking in richness or intensity of color. 6. slow in motion or action; not brisk; sluggish: a dull day in the stock market. 7. mentally slow; lacking brightness of mind; somewhat stupid; obtuse. 8. lacking keenness of perception in the senses or feelings; insensible; unfeeling. 9. not intense or acute: a dull pain. —v.t., v.i. to make or become dull. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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