Deep; descending or being far below the surface, or far below the adjacent places; having great depth.Specifically — In anatomy, deep-seated; not superficial: specifically applied to several structures, as arteries and muscles. See profunda.In entomology, strongly impressed; very deep and distinct: as, profound punctures, striæ, or indentations.Coming from a great depth; deepfetched.Bending low; hence, lowly; humble; exhibiting or expressing deep humility: as, a profound bow.Intellectually deep; entering deeply into subjects; not superficial or obvious; deep in knowledge or skill; penetrating.Characterized by magnitude or intensity; deep-felt; intense; great.Deep-seated; thorough; complete.Deep in skill or contrivance.Having hidden qualities; obscure; abstruse.n. A deep, immeasurable space; an abyss.n. The deep; the sea; the ocean: with the definite article.To cause to sink deeply; cause to penetrate far down.To penetrate.To dive; penetrate.