· causing or capable of causing death; "a fatal accident"; "a deadly enemy"; "mortal combat"; "a mortal illness"
· of an instrument of certain death; "deadly poisons"; "lethal weapon"; "a lethal injection"
Synonym(s): lethal
· extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite"
Synonym(s): venomous, virulent
· involving loss of divine grace or spiritual death; "the seven deadly sins"
Synonym(s): mortal
· exceedingly harmful
Synonym(s): baneful, pernicious, pestilent
· (of a disease) having a rapid course and violent effect
· as if dead
Synonym(s): lifelessly
· (used as intensives) extremely; "she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous"
Synonym(s): madly, insanely, deucedly, devilishly