How to say "deeply, deep" in Russian?

Глубоко

"deeply, deep" is Глубоко in Russian.

Глубоко means "deeply, deep" in English.

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Word #2384 of 4,000 by frequency in Russian — level B2.

Example

Озеро оказалось глубоко, и мы не рискнули нырять.

The lake turned out to be deep, so we didn't dare dive.