Webster's English Dictionary

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deaden

dead.en \'ded-*n\ \'ded-nin, -*n-in\ vb or dead.en.ing 1: to impair in 
   vigor or sensation : BLUNT  2a: to deprive of brilliancy  2b: to make vapid 
   or spiritless  2c: to make (as a wall) impervious to sound  3: to deprive 
   of life : KILL  : to become dead : lose life or vigor