lethal
US /ˈliː.θəl/
UK /ˈliː.θəl/

1.
letal, mortal
sufficient to cause death
:
•
The snake's venom was lethal.
O veneno da cobra era letal.
•
He received a lethal dose of radiation.
Ele recebeu uma dose letal de radiação.
2.
fatal, destrutivo
harmful or destructive in a significant way
:
•
The company made a lethal mistake in its marketing strategy.
A empresa cometeu um erro fatal em sua estratégia de marketing.
•
His criticism was lethal to her confidence.
A crítica dele foi letal para a confiança dela.