depth

The extent downward or backward or inward.

“the depth of the water”

“depth of a shelf”

The intellectual ability to penetrate deeply into ideas.

Degree of psychological or intellectual profundity.

The attribute or quality of being deep, strong, or intense.

“the depth of his breathing”

“the depth of his sighs”

(usually plural) a low moral state.

“he had sunk to the depths of addiction”