| basal(adjective, simple, plain, important, significant) |
| basic(adjective, simple, plain, important, significant) |
| elemental(adjective, simple, plain, important, significant) |
| elementary(adjective, simple, plain, important, significant) |
| essential(adjective, simple, plain, important, significant) |
| foundational(adjective, simple, plain, important, significant) |
| fundamental(adjective, clear, simple, plain, important) |
| intrinsic(adjective, important, significant, original, essential) |
| original(adjective, simple, plain, important, significant) |
| primitive(adjective, simple, plain, important, significant) |
| rudimentary(adjective, simple, plain, important, significant) |
| underlying(adjective, simple, plain, important, significant) |
| primary(adjective, simple, plain, important, significant) |
| ABCs(adjective, simple, straightforward, basic, fundamental) |
| abecedarian(adjective, simple, straightforward, basic, fundamental) |
| axiological(adjective, important, significant, original, essential) |
| axiomatic(adjective, important, significant, original, basic) |
| beginning(adjective, simple, straightforward, basic, fundamental) |
| bottom(adjective, important, significant, original, essential) |
| bottom-line(adjective, important, significant, original, essential) |