| low-pressure(cool, simple, relaxed, familiar, straightforward) |
| mellow(cool, simple, relaxed, indifferent, casual) |
| mere(adjective, simple, clean, plain, pure) |
| mixed(adjective, simple, easy, plain, modest) |
| motley(adjective, simple, easy, plain, modest) |
| naive(adjective, open, smooth, simple, easy) |
| not complex(expression, adjective, clean, plain, pure) |
| nubby |
| off-the-cuff(adjective, simple, easy, plain, modest) |
| offhanded |
| open(adjective, simple, easy, plain, straightforward) |
| open and shut(expression, adjective, idiom, clean, plain) |
| outspoken(adjective, succinct) |
| plain-spoken(adjective, succinct) |
| popular |
| primitive(simple, easy, real, genuine, unaffected) |
| provincial(simple, easy, real, genuine, unaffected) |
| pure(adjective, simple, clean, plain, natural) |
| pure and simple(expression, adjective, idiom, clean, plain) |
| raw(adjective, simple, clean, natural, straightforward) |