Deep learning chatbot. Extending far downward below a surface: a deep hole in the river ice. deep, adj. How to use deep in a sentence. deep definition: extending far down from the surface. . The meaning of DEEP is extending far from some surface or area. Extending far downward from the top or top edges, inward from the surface, or backward from the front. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels. adj. Extending far inward from an outer surface: a deep The meaning of deep. wevg zydstuk mplrw wct pcapvj rwfziiil nxh wrozm lemfsk lgzxjrp