| not vague(expression, exact, specific, explicit) |
| obvious(adjective, clear, simple, sharp, exact) |
| ocular(adjective, visual, sound, physical, nervous) |
| olfactive(adjective, visual, sound, physical, nervous) |
| olfactory(adjective, visual, sound, physical, nervous) |
| open and shut(expression, idiom, simple, sharp, distinct) |
| ophthalmic(adjective, visual, sound, physical, nervous) |
| optic(adjective, visual, sound, physical, nervous) |
| palpable(adjective, clear, simple, sharp, exact) |
| particular(exact, specific, explicit) |
| patent(adjective, clear, simple, sharp, definite) |
| perceptible by ear(expression, idiom) |
| perspicuous(clear, simple, sharp, definite, distinct) |
| precise(simple, sharp, distinct, understandable, well-defined) |
| pronounced(adjective, clear, simple, sharp, exact) |
| quad |
| readable(simple, sharp, distinct, understandable, well-defined) |
| receptive(visual, sound, physical, nervous, nerve) |
| recognizable(clear, simple, sharp, definite, distinct) |
| resonant |