deaden

make vague or obscure or make (an image) less visible; "muffle the message"

cut a girdle around so as to kill by interrupting the circulation of water and nutrients; "girdle the plant"

make vapid or deprive of spirit; "deadened wine"

lessen the momentum or velocity of; "deaden a ship's headway"

become lifeless, less lively, intense, or active; lose life, force, or vigor

make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation; "Terror blunted her feelings"; "deaden a sound"

convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil