- I. Of non-physical depth.
- 1. a. Of a person: characterized by intellectual depth; having great insight into or knowledge of something; very learned. Formerly also: crafty, cunning (cf. DEEP adj. 17) (obs.).
- b. Of personal attributes, actions, works, etc.: showing depth of insight or knowledge; marked by great learning.
- 2. a. Of a field of knowledge, intellectual topic, etc.: demanding deep study, research, or consideration; containing great depths of meaning and import; (of meaning or significance) deep, important.
- c. Of reverence, respect, etc.: sincere; humble.
Formerly sometimes with reference to the idea of bowing low (cf. sense A. 3d).
- d. Of sleep, silence, etc.: in which a person is or may be deeply immersed; unbroken, complete.
- II. Of physical depth.
- 3. a. That has great downward or inward extent; very deep.
- b. Of a sigh, sob, etc.: originating in or coming from a great depth; made with a deep breath (chiefly with the implication of deeply-felt emotion: cf. sense A. 2b).
- c. Situated far beneath a surface (esp. that of the body); deep-seated; deeply-buried. Also fig. and in figurative contexts.
- d. Of a bow, etc.: sinking to a great depth; very low (chiefly with the implication of deep respect: cf. sense A. 2c).
- 1. Chiefly poet. The deepest or innermost part of something; a very deep place; an abyss; spec. the depths of the sea (cf. DEEP n. 3a). Also fig. Now rare.
- 2. Intellectual depth. Obs. rare 1.