| Adj. | 1. | deep - 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; "a deep well"; "a deep dive"; "deep water"; "a deep casserole"; "a deep gash"; "deep massage"; "deep pressure receptors in muscles"; "deep shelves"; "a deep closet"; "surrounded by a deep yard"; "hit the ball to deep center field"; "in deep space"; "waist-deep" |
| 2. | unfathomable - resembling an abyss in depth; so deep as to be unmeasurable; "the abyssal depths of the ocean" deep - 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; "a deep well"; "a deep dive"; "deep water"; "a deep casserole"; "a deep gash"; "deep massage"; "deep pressure receptors in muscles"; "deep shelves"; "a deep closet"; "surrounded by a deep yard"; "hit the ball to deep center field"; "in deep space"; "waist-deep" | |
| 3. | unfathomable - impossible to come to understand uncomprehensible, incomprehensible - difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein |