descending far below the surface; opening or reaching to a great depth; deep.-intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough; as, a profound investigation or treatise; a profound scholar; profound wisdom.-characterized by intensity; deeply felt; pervading; overmastering; far-reaching; strongly impressed; as, a profound sleep.-bending low, exhibiting or expressing deep humility; lowly; submissive; as, a profound bow.-the deep; the sea; the ocean.-an abyss.-to cause to sink deeply; to cause to dive or penetrate far down.-to dive deeply; to penetrate.