Noah Webster's New International Dictionary of the English Language

1. (a.) Descending far below the surface; opening or reaching to a great depth; deep.

2. (a.) 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. (a.) Characterized by intensity; deeply felt; pervading; overmastering; far-reaching; strongly impressed; as, a profound sleep.

4. (a.) Bending low, exhibiting or expressing deep humility; lowly; submissive; as, a profound bow.

5. (n.) The deep; the sea; the ocean.

6. (n.) An abyss.

7. (v. t.) To cause to sink deeply; to cause to dive or penetrate far down.

8. (v. i.) To dive deeply; to penetrate.