крепко спал

slept soundly

→ крепко
phrase Uncommon #21,250
slept soundly Used when someone is sleeping deeply and is not easily woken up.
RU: Я крепко спал и не слышал телефон.
EN: I slept soundly and didn't hear the phone.

Ребёнок крепко спал.

The child was fast asleep.

Скажешь, что крепко спал.

You'll say that you slept soundly.

— Москва слезам не верит (1980)

Он крепко спал.

He was fast asleep.

Когда Мэри вошла в комнату, Том крепко спал.

When Mary entered the room, Tom was fast asleep.

Котёнок крепко спал.

The kitten was fast asleep.