profound Definition

profound
adj profounder, profoundest

1. Radical, extensive, far-reaching.

Example: profound changes
2. Deep; far below the surface.
3. Said of a feeling: deeply felt or rooted.

Thesaurus: heart-rending, heartfelt, great, intense, extreme, total, utter, thoroughgoing, complete, absolute, extensive, exhaustive, consummate; Antonym: mild.
4. Said of comments, etc: showing understanding or penetration.

Thesaurus: learned, wise, intellectual, scholarly, erudite, sage, sagacious, philosophical, discerning, keen, skilled.
5. Penetrating deeply into knowledge.
6. Intense; impenetrable.

Example: profound deafness
7. Said of sleep: deep; sound.

Derivative: profoundly
adverb

Very, extremely or intensely (used for emphasis)
Thesaurus: seriously, greatly, extremely, sincerely, deeply, awfully, intensely, thoroughly, heartily, dreadfully, acutely, abjectly, keenly; Antonym: slightly.

Derivative: profundity
noun

The state or degree of being profound.
Thesaurus: depth, deepness, subtlety, complexity, perception, intelligence, insight, wisdom, acumen, acuity, learning, sagacity, perceptiveness, perspicacity, erudition, profoundness, seriousness, perspicuity, strength.

Etymology: 14c: from Latin profundus deep.