Longman Dictionary of Contemporary English homepage

deadly

1 adjective
     
dead‧ly1
1

very dangerous

likely to cause death [= lethal]:
a deadly poison
a deadly weapon
2

deadly enemy

someone who will always be your enemy and will try to harm you as much as possible:
The two rapidly became deadly enemies.
3

complete

complete or total:
We sat in deadly silence.
He was in deadly earnest (=completely serious).
4

very effective

causing harm in a very effective way:
She hit the target with deadly accuracy.
5

like death

[only before noun] like death in appearance:
His face had a deadly paleness.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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