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English definition of “dull”

dull

adjective uk   /dʌl/ us  

dull adjective (BORING)

B1 not interesting or exciting in any way: She wrote dull, respectable articles for the local newspaper. He's pleasant enough, but deadly dull.
Synonym

dull adjective (NOT BRIGHT)

C1 not clear, bright, or shiny: We could just see a dull glow given off by the fire's last embers. The first day of our holiday was dull (= cloudy).

dull adjective (NOT SHARP)

describes a sound or pain that is not sharp or clear: I heard a dull thud from the kitchen and realized she must have fainted. The dull rumble of traffic woke her. She felt a dull ache at the back of her head. old-fashioned not intelligent
dully
adverb uk   /ˈdʌl.li/ us  
The car lights glowed dully through the mist. My arm still ached dully.
dullness
noun [U] uk   /ˈdʌl.nəs/ us  

dull

verb [T] uk   /dʌl/ us  
to make something less severe: Homeless children sniff glue to dull their hunger pains.
(Definition of dull from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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