[Gluboko]
"deeply, deep" is Глубоко in Russian.
Глубоко means "deeply, deep" in English.
Listen to the pronunciationWord #2384 of 6,000 by frequency in Russian.
Здесь очень глубоко, поэтому мы не рискнули нырять.
The lake turned out to be deep, so we didn't dare dive.