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deadly

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1deadly/ˈdɛdli/adjective
deadlierdeadliest
1deadly
/ˈdɛdli/
adjective
deadlierdeadliest
Learner's definition of DEADLY  
[or more deadly; most deadly]
: causing or able to cause death
— compare deathly
: extremely accurate and effective
always used before a noun  : extreme or complete
informal  : very boring

— deadliness

noun,[noncount]
deadlymortalfatal,  and lethal mean causing or able to cause death.
deadly describes something that is very dangerous and likely or able to cause death.
mortal describes a wound or injury that has already caused death or will soon cause death.
fatal describes something that has actually caused a person's death.
lethal usually describes something like a poison that is used for the purpose of destroying life.
2deadly/ˈdɛdli/adverb
deadlierdeadliest
2deadly
/ˈdɛdli/
adverb
deadlierdeadliest
Learner's definition of DEADLY  
[or more deadly; most deadly]
: extremely or completely
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