- 1[transitive, intransitive] dull (something) (of pain or an emotion) to become or be made weaker or less severe The pills they gave him dulled the pain for a while. person
- 2[transitive] dull somebody to make a person slower or less lively He felt dulled and stupid with sleep. colors, sounds
- 3[intransitive, transitive] to become or to make something less bright, clean, or sharp His eyes dulled and he slumped to the ground. dull something The endless rain seemed to dull all sound.
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NAmE//dʌl//Verb Forms present simple I / you / we / they dull
he / she / it dulls
past simple dulled
-ing form dulling