(adjective, adverb)


1. causing or capable of causing death

- a deadly enemy

Similar word(s): fatal, deathly, mortal

2. of an instrument of certain death

- deadly poisons

Similar word(s): fatal, lethal

3. extremely poisonous or injurious; producing venom

Similar word(s): toxic, venomous, virulent

4. involving loss of divine grace or spiritual death

- the seven deadly sins

Similar word(s): unpardonable, mortal

5. exceedingly harmful

Similar word(s): noxious, baneful, pernicious, pestilent

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

Similar word(s): virulent

Sentences with deadly as an adjective:

- deadly enemies


1. as if dead

Similar word(s): lifelessly

2. (used as intensives) extremely

- deadly dull

- deadly earnest

Similar word(s): deucedly, devilishly, insanely, madly

Sentences with deadly as an adverb:

- Her face suddenly became deadly white.