Noun

1. The central and most intense or profound part
2. A long steep-sided depression in the ocean floor
3. Literary term for an ocean

Adjective

1. Relatively deep or strong; affecting one deeply
2. Having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination

Adverb

1. To a great depth;far down
2. To an advanced time
3. To a great distance