This is the 821st most frequent Dutch word.
diep
Deep.
Here, 'diep' serves as an adjective describing the depth of the well.
De put is erg diep.
The well is very deep.
Here, 'diep' is used as an adverb to describe the profoundness of his thought process.
Hij denkt diep na over het probleem.
He thinks deeply about the problem.
In this context, 'diepe' functions as an adjective modifying 'ademhaling' (breath) to indicate its intensity.