ˈdiːpnəs dɛpθ pɹəˈfʌndɪti 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 the depth of his emotion the extent downward or backward or inward the depth of the water depth of a shelf depth of a closet the intellectual ability to penetrate deeply into ideas (usually plural) a low moral state he had sunk to the depths of addiction