—adj. 1. penetrating or entering deeply into subjects of thought or knowledge; having deep insight or understanding: a profound thinker. 2. originating in or penetrating to the depths of one's being; profound grief. 3. being or going far beneath what is superficial, external, or obvious: profound insight. 4. of deep meaning; of great and broadly inclusive significance: a profound book. 5. pervasive or intense; thorough; complete: a profound silence. 6. extending, situated, or originating far down, or far beneath the surface: the profound depths of the ocean. 7. low: a profound bow. 8. deep.
—n.Literary. 1. something that is profound.
2. the deep sea; ocean.
3. depth; abyss.