deaden in WordNet English dictionary

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