1) Abstruseness 2) Abstrusity 3) Abyss 4) Depth 5) French word used in English 6) Intellectual depth 7) Penetrating knowledge 8) Profoundness 9) Reconditeness 10) Wisdom 1) Abstrusity 2) Abysm 3) Bottomlessness 4) Complexity 5) Deepness 6) Depth 7) Profoundness 8) Reconditeness 
• (n.) The quality or state of being profound; depth of place, knowledge, feeling, etc.
Pro·fun'di·ty noun ; plural -ties . [ Latin profunditas : confer French profondite . See Profound .] The quality or state of being profound; depth of place, knowledge, feeling, etc. 'The vast profundity obscure.' Milton. 
depth 
[n] - intellectual depth
profundity 1. An insight that deals seriously with the most vital aspects of any question. 2. Something that shows great perceptiveness or knowledge or requires great perceptiveness and knowledge to be properly understood. 3. The intellectual complexity or abstruseness of something. 4. The greatness, strength, or intensity of something. 5. Exte...
profoundness noun the intellectual ability to penetrate deeply into ideas
the quality or state of being profound; depth. · Usually,profound or deep matters. · a profoundly deep place; abyss.