| humanoid |
| hypothetical(excellent, obscure, extraordinary, superior, fantastic) |
| immature |
| in the beginning(expression, adjective, idiom, head, beginning) |
| inchoative |
| indigenous |
| indispensable(adjective, important, significant, original, essential) |
| infantile(adjective, beginning) |
| infinite(excellent, obscure, extraordinary, superior, fantastic) |
| initiative |
| initiatory |
| innate(excellent, obscure, extraordinary, superior, fantastic) |
| intact(excellent, obscure, extraordinary, superior, fantastic) |
| integral(adjective, important, significant, original, essential) |
| intrinsic(adjective, important, significant, original, essential) |
| intuitive(excellent, obscure, extraordinary, superior, fantastic) |
| late(last, original, past, primitive, venerable) |
| lead off(expression, adjective, head, beginning, prime) |
| leading(adjective, head, beginning, opening, original) |
| least(adjective, head, beginning, opening, original) |