| imagination(noun, feeling, understanding, power, spirit) |
| induction(noun, understanding, mind, sense, intelligence) |
| inference(noun, understanding, mind, sense, intelligence) |
| ingenuity(noun, understanding, power, spirit, mind) |
| inner nature(noun, expression, nature, character, attitude) |
| insight(noun, feeling, understanding, mind, intelligence) |
| integrative power |
| intellectual(noun, understanding, power, spirit, ability) |
| intellectual faculty |
| intellectual grasp |
| intellectualism |
| intuition(noun, feeling, understanding, power, spirit) |
| judgment(noun, feeling, understanding, ability, mind) |
| limits(noun, understanding, mind, sense, intelligence) |
| logic(noun, understanding, mind, sense, intelligence) |
| lucidity(noun, understanding, power, spirit, mind) |
| luminosity(noun, understanding, skill, understand, sense) |
| majority(ability, experience, wisdom, readiness, maturity) |
| manhood(ability, experience, wisdom, readiness, maturity) |
| marbles(noun, understanding, power, spirit, mind) |