WordWeb Online

1. Make vague, obscure or make (an image) less visible
   - dampen, damp
    
2. Cut a girdle around so as to kill by interrupting the circulation of water and nutrients
   - girdle
    
3. Make vapid or deprive of spirit
   "deadened wine"
    
4. Lessen the momentum or velocity of
   "deaden a ship's headway"
    
5. Become lifeless, less lively, intense, or active; lose life, force, or vigour
    
6. Make less lively, intense, or vigorous; impair in vigour, force, activity, or sensation
   "deaden a sound";
   - blunt
    
7. (chemistry) convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil

Derived forms: deadens, deadened, deadening

Type of: alter, break, change, convert, damp, dampen, incise, modify, retard, soften, weaken

Antonym: liven