Webster’s Revised Unabridged Dictionary · 1913
Profound
Pro·found′, a. [F. profond, L. profundus; pro before, forward + fundus the bottom. See Found to establish, Bottom lowest part.] 1. Descending far below the surface; opening or reaching to a great depth; deep. "A gulf profound." Milton.
2. 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.
3. Characterized by intensity; deeply felt; pervading; overmastering; far-reaching; strongly impressed; as, a profound sleep. "Profound sciatica." Shak.
Of the profound corruption of this class there can be no doubt. Milman.
4. Bending low, exhibiting or expressing deep humility; lowly; submissive; as, a profound bow.
What humble gestures! What profound reverence! Duppa.
Pro·found′ (prō·found′), n. 1. The deep; the sea; the ocean.
God in the fathomless profound Hath all this choice commanders drowned. Sandys.
2. An abyss. Milton.
Pro·found′, v. t. To cause to sink deeply; to cause to dive or penetrate far down. [Obs.] Sir T. Browne.
Pro·found′, v. i. To dive deeply; to penetrate. [Obs.]