(adj) (used especially of ideas or principles) deeply rooted; firmly fixed or held, Syn. planted, deep-seated, ingrained, implanted, Example:deep-rooted prejudice; deep-seated differences of opinion; implanted convictions; ingrained habits of a lifetime; a deeply planted need
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Of or pertaining to the deeper parts of the sea; as, a deep-sea line (i. e., a line to take soundings at a great depth); deep-sea lead; deep-sea soundings, explorations, etc. [ 1913 Webster ]
2. at some distance from the shore; as, deep-sea fishing. Syn. -- offshore. [ WordNet 1.5 +PJC ]
3. taking place in the deeper parts of the sea; as, deep-sea exploration. [ WordNet 1.5 ]