1. The intellectual ability to penetrate deeply into ideas
   - astuteness, profundity, profoundness, depth 
2. The quality of being physically deep
   - profundity, profoundness 
3. The extent downward or backward or inward
   - depth 
4. A low pitch that is loud and voluminous

Derived forms: deepnesses

See also: deep, shallow

Type of: extent, low frequency, low pitch, sapience, wisdom

Antonym: shallowness

• Sula bassana
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• sulcus
• sulcus centralis
• sulcus lateralis cerebri
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