Synonyms of deadly

Adjective

1. deadly, deathly, mortal, fatal (vs. nonfatal)

usage: causing or capable of causing death; "a fatal accident"; "a deadly enemy"; "mortal combat"; "a mortal illness"

2. deadly, lethal, fatal (vs. nonfatal)

usage: of an instrument of certain death; "deadly poisons"; "lethal weapon"; "a lethal injection"

3. deadly, venomous, virulent, toxic (vs. nontoxic)

usage: extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite"

4. deadly, mortal(prenominal), unpardonable (vs. pardonable)

usage: involving loss of divine grace or spiritual death; "the seven deadly sins"

5. baneful, deadly, pernicious, pestilent, noxious (vs. innocuous)

usage: exceedingly harmful

6. deadly, virulent (vs. avirulent)

usage: (of a disease) having a rapid course and violent effect

Adverb

1. deadly, lifelessly

usage: as if dead

2. madly, insanely, deadly, deucedly, devilishly

usage: (used as intensives) extremely; "she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous"

Definition and meaning of deadly (Dictionary)