| purebred(adjective, pure) |
| requisite(adjective, important, significant, original, basic) |
| rock-bottom(adjective, base, last) |
| significant(adjective, important, original, basic, vital) |
| simon-pure(adjective, pure) |
| simplest(adjective, simple, straightforward, basic, fundamental) |
| simplex(adjective, simple, straightforward, basic, fundamental) |
| simplified(adjective, simple, straightforward, basic, fundamental) |
| sinless(adjective, pure) |
| spotless(adjective, pure) |
| stainless(adjective, pure) |
| stark(adjective, pure) |
| straightforward(adjective, simple, basic, fundamental, uncomplicated) |
| structural(adjective, important, significant, original, basic) |
| substrative(adjective, important, significant, original, essential) |
| supporting(adjective, important, significant, original, basic) |
| sustaining(adjective, important, significant, original, basic) |
| theoretical(adjective, important, significant, original, basic) |
| unadorned(adjective, pure) |
| unadulterated(adjective, pure) |