(the act of making something futile and useless (as by routine))
(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)
(so lacking in interest as to cause mental weariness; "a boring evening with uninteresting people"; "the deadening effect of some routine tasks"; "a dull play"; "his competent but dull performance"; "a ho-hum speaker who couldn't capture their attention"; "what an irksome task the writing of long letters is"- Edmund Burke; "tedious days on the train"; "the tiresome chirping of a cricket"- Mark Twain; "other people's dreams are dreadfully wearisome")