deadly

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”

extremely poisonous or injurious; producing venom

• “venomous snakes”
• “a virulent insect bite”

involving loss of divine grace or spiritual death

• “the seven deadly sins”

exceedingly harmful

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

as if dead

as if produced by death

• “deadly pale”
• “a deadly paralytic stroke”

(used as intensives) extremely

• “she was madly in love”
• “deadly dull”
• “deadly earnest”
• “deucedly clever”
• “insanely jealous”