1. (noun)deep the central and most intense or profound part "in the deep of night"; "in the deep of winter"
2. (noun)trench, deep, oceanic abyss a long steep-sided depression in the oceanfloor
3. (adj)deep literary term for an ocean "denizens of the deep"
4. (adj)deep relatively deep or strong; affecting one deeply "a deep breath"; "a deep sigh"; "deep concentration"; "deep emotion"; "a deep trance"; "in a deep sleep"
5. (adj)deep marked by depth of thinking "deep thoughts"; "a deep allegory"
6. (adj)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"
7. (adj)deep very distant in time or space "deep in the past"; "deep in enemy territory"; "deep in the woods"; "a deep space probe"
8. (adj)deep extreme "in deep trouble"; "deep happiness"
9. (adj)bass, deep having or denoting a low vocal or instrumental range "a deep voice"; "a bass voice is lower than a baritone voice"; "a bass clarinet"
10. (adj)deep, rich strong; intense "deep purple"; "a rich red"
11. (adj)deep relatively thick from top to bottom "deep carpets"; "deep snow"
12. (adj)deep extending relatively far inward "a deep border"
13. (adj)thick, deep (of darkness) very intense "thick night"; "thick darkness"; "a face in deep shadow"; "deep night"
15. (adj)deep with head or backbent low "a deep bow"
16. (adj)cryptic, cryptical, deep, inscrutable, mysterious, mystifying of an obscure nature "the new insurance policy is written without cryptic or mysterious terms"; "a deep dark secret"; "the inscrutable workings of Providence"; "in its mysterious past it encompasses all the dim origins of life"- Rachel Carson; "rituals totally mystifying to visitors from other lands"
17. (adj)abstruse, deep, recondite difficult to penetrate; incomprehensible to one of ordinaryunderstanding or knowledge "the professor's lectures were so abstruse that students tended to avoid them"; "a deep metaphysical theory"; "some recondite problem in historiography"
18. (adverb)deep exhibiting greatcunning usually with secrecy "deep political machinations"; "a deep plot"
19. (adverb)deeply, deep to a great depth;far down "dived deeply"; "dug deep"
20. (adverb)deep, late to an advanced time "deep into the night"; "talked late into the evening"
21. (adverb)deep to a greatdistance "penetrated deep into enemy territory"; "went deep into the woods"
Definition of 'deep' 
