| bland(adjective, plain, ordinary, modest, boring) |
| classic(adjective, simple, clean, plain, pure) |
| clean |
| clear(adjective, succinct) |
| deferential(adjective, quiet, gentle, modest, humble) |
| down(adjective, simple, honest, modest, unaffected) |
| down-to-earth(adjective, quiet, simple, plain, informal) |
| dry(adjective, simple, reasonable, plain, ordinary) |
| extemporaneous |
| fair(adjective, simple, reasonable, plain, ordinary) |
| friendly(adjective, open, simple, informal, ordinary) |
| guileless(adjective, open, simple, honest, plain) |
| inartificial(adjective, open, simple, easy, plain) |
| inelaborate(adjective, simple, reasonable, clean, honest) |
| innocent(adjective, open, simple, easy, plain) |
| innocuous(simple, fresh, innocent, ignorant, childlike) |
| jejune(simple, plain, fresh, innocent, sincere) |
| low-key(adjective, simple, modest, unsophisticated, understated) |
| mediocre |
| mere(adjective, simple, clean, plain, pure) |