(deadlier, deadliest)
1.
If something is ~, it is likely or able to cause someone’s death, or has already caused someone’s death.
He was acquitted on charges of assault with a ~ weapon.
...a ~ disease currently affecting dolphins...
Passive smoking can be ~ too...
= lethal, fatal
ADJ
2.
If you describe a person or their behaviour as ~, you mean that they will do or say anything to get what they want, without caring about other people.
The Duchess levelled a ~ look at Nikko.
ADJ disapproval
3.
You can use ~ to emphasize that something has a particular quality, especially an unpleasant or undesirable quality.
Broadcast news was accurate and reliable but ~ dull...
= deathly
ADV: ADV adj emphasis
4.
A ~ situation has unpleasant or dangerous consequences.
...the ~ combination of low expectations and low achievement...
ADJ: usu ADJ n
5.
Deadly enemies or rivals fight or compete with each other in a very aggressive way.
The two became ~ enemies...
ADJ