definition of
deadly

[1] #1 deadly s. [deathly, mortal] causing or capable of causing death; "a fatal accident"; "a deadly enemy"; "mortal combat"; "a mortal illness". wn

[2] #2 deadly s. [lethal] of an instrument of certain death; "deadly poisons"; "lethal weapon"; "a lethal injection". wn

[3] #3 deadly r. [lifelessly] as if dead. wn

[4] #4 deadly r. [madly, insanely, deucedly, devilishly] (used as intensives) extremely; "she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous". wn

[5] #5 deadly s. [venomous, virulent] extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite". wn