使变钝( dull的过去式和过去分词 )；使减少；使麻木；使晦暗；

1. deprived of color

    e.g. colors dulled by too much sun
           greyed with the dust of the road

    Synonym: greyed

2. made dull or blunt

    Synonym: blunted

3. having lost or been caused to lose interest because of overexposure

    e.g. the mind of the audience is becoming dulled
           the benumbed intellectual faculties can no longer respond

    Synonym: benumbed