| stale(adjective, simple, ordinary, familiar, natural) |
| trivial(adjective, simple, ordinary, familiar, natural) |
| ugly as sin(expression, idiom, ugliness) |
| unalluring(adjective, nasty, plain, ugly, unattractive) |
| uncomplicated(adjective, simple, clean, plain, pure) |
| unelaborate(adjective, simple, clean, plain, pure) |
| unimaginative |
| unmixed(adjective, simple, clean, plain, pure) |
| unrefined(adjective, simple, common, usual, unsophisticated) |
| unseemly(adjective, plain, awful, shabby, revolting) |
| vanilla(adjective, simple, clean, plain, pure) |
| abashed(adjective, humble) |
| absolute(adjective, simple, clean, plain, pure) |
| abstemious(adjective, soft, shy, meek, frugal) |
| animal(adjective, plain, unpleasant, awful, revolting) |
| appalling(adjective, plain, unpleasant, awful, revolting) |
| apparent |
| artlessly |
| average(adjective, simple, pure, ordinary, familiar) |
| awful(adjective, plain, unpleasant, ugly, revolting) |