deep 普通用词，指由上到下，或由表及里的深度，可指具体或抽象事物。
profound 语气较强，较为庄重，多指抽象的事物，多用于比喻。
参考例句
1. But some people get deep into debt. 但有些人也深陷于债务之中。
2. The wounds of rejection go very deep. 拒绝所造成的伤害是很深的。
3. Love a man, not become a simple thing, that is must be sensation not deep. 爱一个人，没有成为一件简单的事，那一定是因为感情深度不够。
英英解释
n.
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 adj.
1. relatively deep or strong; affecting one deeply
2. marked by depth of thinking
3. having great spatial extension or penetration downward or inward from an outer surface or backward o
4. very distant in time or space
5. extreme
6. having or denoting a low vocal or instrumental range
7. strong; intense
8. relatively thick from top to bottom
9. extending relatively far inward
10. (of darkness) very intense
11. large in quantity or size
12. with head or back bent low
13. of an obscure nature
14. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
15. exhibiting great cunning usually with secrecy adv.
1. to a great depth
2. to an advanced time
3. to far into space
