| fundamental(adjective, simple, plain, important, straightforward) |
| basic(adjective, simple, plain, base, important) |
| essential(adjective, simple, plain, important, significant) |
| primary(adjective, simple, plain, base, important) |
| elementary(adjective, simple, plain, important, significant) |
| elemental(adjective, simple, plain, important, significant) |
| cardinal(noun, adjective, important, significant, original) |
| overarching |
| radical(adjective, base, important, significant, last) |
| rudimentary(adjective, simple, plain, important, significant) |
| inherent(adjective, essential, basic, absolute, fundamental) |
| basal(adjective, simple, plain, base, important) |
| intrinsic(adjective, important, significant, original, essential) |
| primitive(adjective, simple, plain, important, significant) |
| bottom(noun, adjective, important, significant, original) |
| hidden(adjective, fundamental, latent) |
| prime(adjective, important, significant, original, essential) |
| principal(adjective, important, significant, original, essential) |
| crucial(adjective, important, significant, original, essential) |
| foundational(adjective, simple, plain, base, important) |