fluently

He spoke easily, fluently, and calmly: a man supremely self-controlled.

You speak foreign languages—at least, French and German—fluently.

She spoke French and Italian as fluently as she did English.

He said this with a slightly foreign accent, but fluently and easily.

Then the great man began to swear, and did it well and fluently, with gusto.

Father Pedro says you are getting on fluently with your translations.

He spoke German fluently, and his commands were promptly obeyed.

Yes; but I had never heard that they quoted the Æneid so fluently.

Abramovitch and his wife spoke French fluently, the former also English.

You speak English as naturally and fluently as if you were born to the tongue.