| undecorated(adjective, simple, clean, plain, pure) |
| understandable(adjective, simple, sharp, distinct, obvious) |
| unpretentious(adjective, simple, clean, plain, pure) |
| untroublesome(adjective, clear, light, smooth, simple) |
| unworldly(adjective, simple, slow, stupid, natural) |
| user-friendly(adjective, easy) |
| vanilla(adjective, simple, clean, plain, pure) |
| wieldy(adjective, clear, light, smooth, simple) |
| ABCs(simple, straightforward, basic, fundamental) |
| abecedarian(simple, straightforward, basic, fundamental) |
| above-board |
| absolute(adjective, simple, clean, plain, pure) |
| apprehensible(simple, sharp, distinct, understandable, well-defined) |
| audible(simple, sharp, distinct, understandable, well-defined) |
| authentic(adjective, simple, pure, natural, straightforward) |
| beginning(simple, straightforward, basic, fundamental) |
| blank |
| breeze |
| classic(adjective, simple, clean, plain, pure) |
| clear-cut(sharp, distinct, well-defined) |