| lucidity(noun, understanding, power, spirit, mind) |
| luminosity(noun, understanding, skill, understand, sense) |
| makeup(noun, understanding, philosophy, character, position) |
| marbles(noun, understanding, power, spirit, mind) |
| mental age(noun, expression, understanding, philosophy, character) |
| nous |
| observation(noun, power, spirit, mind, reason) |
| outlook(noun, understanding, philosophy, character, position) |
| penetration(noun, understanding, understand, sense, judgment) |
| personality(noun, understanding, philosophy, character, position) |
| perspicacity(noun, understanding, mind, understand, sense) |
| precocity(noun, understanding, mind, skill, understand) |
| psyche(noun, understanding, power, spirit, mind) |
| psychology(noun, understanding, philosophy, character, position) |
| quickness(noun, understanding, skill, understand, sense) |
| quotient(noun, understanding, skill, understand, sense) |
| ratiocination(noun, power, spirit, mind, reason) |
| rationality(noun, understanding, philosophy, character, position) |
| reasoning(noun, understanding, power, philosophy, character) |
| reasoning power(expression, idiom) |