How to say "firmly, tightly, soundly" in Russian?

Крепко

"firmly, tightly, soundly" is Крепко in Russian.

Крепко means "firmly, tightly, soundly" in English.

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Word #3417 of 4,000 by frequency in Russian — level B2.

Example

Ребёнок крепко спал после долгой прогулки в парке.

The child slept soundly after a long walk in the park.