S: (v) dampen, deaden, damp (make vague or obscure or make (an image) less visible) "muffle the message"
S: (v) girdle, deaden (cut a girdle around so as to kill by interrupting the circulation of water and nutrients) "girdle the plant"
S: (v) deaden (make vapid or deprive of spirit) "deadened wine"
S: (v) deaden (lessen the momentum or velocity of) "deaden a ship's headway"
S: (v) deaden (become lifeless, less lively, intense, or active; lose life, force, or vigor)
S: (v) deaden, blunt (make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation) "Terror blunted her feelings"; "deaden a sound"
S: (v) deaden (convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil)
Adjective
S: (adj) boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome (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"