deadly

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

deathly mortal lifelessly deucedly insanely devilishly madly lethal venomous virulent baneful pernicious pestilent

deaden

deadly nightshade deadly sin