This is the 16802nd most frequent Russian word.
смертельных
Deadly.
Used as an adjective to describe dangers as deadly.
Этот фильм полон смертельных опасностей.
This movie is full of deadly dangers.
Used as an adjective to describe doses as lethal or deadly.
Они исследовали влияние смертельных доз радиации.
They studied the effects of lethal doses of radiation.
Used as an adjective to describe enemies who are dangerously threatening or deadly.