This is the 1559th most frequent Korean word.
깊이
Depth.
In this usage, '깊이' represents a descriptive sense to characterize the profoundness of her emotions.
그녀의 감정은 깊이 있었다.
Her feelings were deep.
In this sentence, '깊이' is used as an adverb to describe the manner of the thinking, indicating a profound or thorough consideration.
그는 깊이 생각했다.
He thought deeply.
Here, '깊이' is used as a noun, referring to the physical measurement of how deep the lake is.