Read the dictionary definition of deep. All definitions for this word.
1. literary term for an ocean
1. denizens of the deep
2. a long steep-sided depression in the ocean floor
3. the central and most intense or profound part
1. in the deep of night
2. in the deep of winter
4. exhibiting great cunning usually with secrecy
1. deep political machinations
2. a deep plot
5. strong; intense
1. deep purple
2. a rich red
6. very distant in time or space
1. deep in the past
2. deep in enemy territory
3. deep in the woods
4. a deep space probe
7. 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
1. a deep well
2. a deep dive
3. deep water
4. a deep casserole
5. a deep gash
6. deep massage
7. deep pressure receptors in muscles
8. deep shelves
9. a deep closet
10. surrounded by a deep yard
11. hit the ball to deep center field
12. in deep space
13. waist-deep
8. relatively deep or strong; affecting one deeply
1. a deep breath
2. a deep sigh
3. deep concentration
4. deep emotion
5. a deep trance
6. in a deep sleep
9. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
1. the professor's lectures were so abstruse that students tended to avoid them
2. a deep metaphysical theory
3. some recondite problem in historiography
10. of an obscure nature
1. the new insurance policy is written without cryptic or mysterious terms
2. a deep dark secret
3. the inscrutable workings of Providence
4. in its mysterious past it encompasses all the dim origins of life
5. rituals totally mystifying to visitors from other lands
11. with head or back bent low
1. a deep bow
12. having or denoting a low vocal or instrumental range
1. a deep voice
2. a bass voice is lower than a baritone voice
3. a bass clarinet
13. large in quantity or size
1. deep cuts in the budget
14. intense or extreme
1. in deep trouble
2. deep happiness
15. (of darkness) densely dark
1. thick night
2. thick darkness
3. a face in deep shadow
4. deep night
16. marked by depth of thinking
1. deep thoughts
2. a deep allegory
17. relatively thick from top to bottom
1. deep carpets
2. deep snow
18. extending relatively far inward
1. a deep border
19. to a great depth; far down or in
1. dived deeply
2. dug deep
20. to a great distance
1. penetrated deep into enemy territory
2. went deep into the woods
21. to an advanced time
1. deep into the night
2. talked late into the evening
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Merriam-Webster definition of deep