How to say "carefully, thoroughly" in Russian?

Тщательно

"carefully, thoroughly" is Тщательно in Russian.

Тщательно means "carefully, thoroughly" in English.

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Word #3446 of 4,000 by frequency in Russian — level B2.

Example

Врач тщательно осмотрел пациента и назначил лечение.

The doctor carefully examined the patient and prescribed treatment.