| fundamental(adjective, clear, simple, plain, pure) |
| basic(adjective, simple, base, pure, important) |
| basal(adjective, simple, base, pure, important) |
| elementary(adjective, simple, pure, important, straightforward) |
| radical(adjective, base, important, last, original) |
| underlying(adjective, simple, base, important, straightforward) |
| bottom(adjective, important, significant, original, basic) |
| primary(adjective, simple, base, pure, important) |
| elemental(adjective, simple, pure, important, straightforward) |
| initial(adjective, simple, opening, straightforward, basic) |
| nascent(adjective, pure) |
| original(adjective, simple, important, opening, straightforward) |
| prime(adjective, pure, important, significant, original) |
| aboriginal(adjective, pure) |
| essential(adjective, simple, plain, pure, important) |
| formative(adjective, pure) |
| introductory(adjective, simple, opening, straightforward, basic) |
| primal(adjective, pure) |
| primitive(adjective, simple, important, straightforward, original) |
| rudimentary(adjective, simple, important, straightforward, original) |