| prime(adjective, important, significant, original, essential) |
| primo(adjective, simple, straightforward, basic, fundamental) |
| primordial(adjective, rough, important, significant, original) |
| principal(adjective, important, significant, original, essential) |
| radical(adjective, important, significant, original, essential) |
| requisite(adjective, important, significant, original, essential) |
| rudimental(adjective, undemanding, realizable, elementary, primo) |
| significant(adjective, important, original, essential, basic) |
| simple(adjective, straightforward, basic, fundamental, unsophisticated) |
| simplest(adjective, simple, straightforward, basic, fundamental) |
| simplex(adjective, simple, straightforward, basic, fundamental) |
| simplified(adjective, simple, straightforward, basic, fundamental) |
| straightforward(adjective, simple, basic, fundamental, uncomplicated) |
| structural(adjective, important, significant, original, basic) |
| substrative(adjective, important, significant, original, essential) |
| supporting(adjective, important, significant, original, essential) |
| sustaining(adjective, important, significant, original, essential) |
| theoretical(adjective, important, significant, original, essential) |
| uncomplex(adjective, simple, straightforward, basic, fundamental) |
| uncomplicated(adjective, simple, straightforward, basic, fundamental) |