| inborn(adjective, characteristic, natural, essential, basic) |
| inherent(adjective, characteristic, complete, natural, essential) |
| congenital(adjective, characteristic, natural, essential, basic) |
| inbred(adjective, characteristic, natural, essential, basic) |
| innate(adjective, characteristic, natural, essential, basic) |
| intrinsic(adjective, characteristic, natural, essential, basic) |
| constitutional(adjective, characteristic, natural, essential, basic) |
| deep-seated(adjective, characteristic, natural, essential, basic) |
| elemental(adjective, characteristic, complete, essential, basic) |
| absolute(adjective, basic, fundamental, central) |
| cold(adjective, basic, absolute, fundamental) |
| complete(adjective, utter, basic, absolute, fundamental) |
| ideal(adjective, basic, absolute, fundamental) |
| material(adjective, essential, basic, absolute, fundamental) |
| name of the game(expression, adjective, idiom, basic, absolute) |
| nitty-gritty(adjective, basic, absolute, fundamental) |
| nub(adjective, basic, absolute, fundamental) |
| perfect(adjective, basic, absolute, fundamental) |
| primary(adjective, cause, basic, absolute, fundamental) |
| primitive(adjective, cause, original, basic, absolute) |