1lacking interest or excitement:your diet doesn’t have to be dull and boring archaic (of a person) feeling bored and dispirited: she said she wouldn’t be dull and lonely
2lacking brightness, vividness, or sheen:his face glowed in the dull lamplight his black hair looked dull (of the weather) overcast; gloomy:next morning dawned dull (of sound) not clear; muffled:a dull thud of hooves (of pain) indistinctly felt; not acute:there was a dull pain in his lower jaw (of an edge or blade) blunt: when cutting hard rock the edge soon became dull (of activity) sluggish or slow-moving:shares closed weaker after a day of dull trading
3(of a person) slow to understand; stupid:the voice of a teacher talking to a rather dull child archaic (of a person’s senses) not perceiving things distinctly.
make or become dull or less intense: [with object]:time dulls the memory [no object]:Albert’s eyes dulled a little
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adjective -
(also dulness) noun -
adverb