lethal
US /ˈliː.θəl/
UK /ˈliː.θəl/
1.
sufficient to cause death
:
•
The snake's venom was lethal.
•
He received a lethal dose of radiation.
2.
harmful or destructive in a significant way
:
•
The company made a lethal mistake in its marketing strategy.
•
His criticism was lethal to her confidence.