profound

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Situated at, extending to, or coming from a great depth; deep.
2. adj. Coming as if from the depths of one's being: profound contempt.
3. adj. Thoroughgoing; far-reaching: profound social changes.
4. adj. Penetrating beyond what is superficial or obvious: a profound insight.
5. adj. Unqualified; absolute: a profound silence.

Century Dictionary and Cyclopedia

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

Wiktionary

1. adj. Descending far below the surface; opening or reaching to a great depth; deep.
2. adj. Very deep; very serious
3. adj. 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.
4. adj. Characterized by intensity; deeply felt; pervading; overmastering; far-reaching; strongly impressed; as, a profound sleep.
5. adj. Bending low, exhibiting or expressing deep humility; lowly; submissive; as, a profound bow.
6. n. obsolete The deep; the sea; the ocean.
7. n. obsolete An abyss.
8. v. obsolete To cause to sink deeply; to cause to dive or penetrate far down.
9. v. obsolete To dive deeply; to penetrate.

GNU Webster's 1913

1. adj. Descending far below the surface; opening or reaching to a great depth; deep.
2. adj. Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough.
3. adj. Characterized by intensity; deeply felt; pervading; overmastering; far-reaching; strongly impressed.
4. adj. Bending low, exhibiting or expressing deep humility; lowly; submissive.
5. n. The deep; the sea; the ocean.
6. n. An abyss.
7. v. obsolete To cause to sink deeply; to cause to dive or penetrate far down.
8. v. obsolete To dive deeply; to penetrate.

WordNet 3.0

1. adj. far-reaching and thoroughgoing in effect especially on the nature of something
2. adj. showing intellectual penetration or emotional depth
3. adj. situated at or extending to great depth; too deep to have been sounded or plumbed
4. adj. (of sleep) deep and complete
5. adj. of the greatest intensity; complete.
6. adj. coming from deep within one