To a deep extent or degree; very greatly.
I am deeply concerned about this matter.
So as to extend far down or far into something.
The surface of the planet was deeply cratered.
At depth.
From Middle English depely, deplike, deopliche, from Old English dēoplīċe (“deeply”, adverb), from dēoplīc (“deep”), equivalent to deep + -ly.
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In this part of the river salmon swim deeply.