(noun)
the extent downward or backward or inward
the depth of the water
depth of a shelf
depth of a closet
(noun)
the intellectual ability to penetrate deeply into ideas
(noun)
degree of psychological or intellectual profundity
(noun)
the attribute or quality of being deep, strong, or intense
the depth of his breathing
the depth of his sighs
the depth of his emotion
(noun)
(usually plural) a low moral state
he had sunk to the depths of addiction