| transpicuous(clear, sharp, distinct, articulate, transparent) |
| unambivalent(adjective, intelligible) |
| unchallenged |
| unconfused |
| uncontestable |
| unmitigated(adjective, clear, pure, certain, regular) |
| well-marked(exact, specific, explicit) |
| absolutely certain(expression, adjective, set, solid, certain) |
| acerbic(sharp, unkind, caustic, cutting, hurtful) |
| actual(adjective, clear, certain, sure, decisive) |
| advisable(adjective, sound, sensible, rational, intelligent) |
| all there(expression, adjective, sound, sensible, rational) |
| apprehensible(sharp, distinct, articulate, silver-tongued, well-spoken) |
| arguable(adjective, sound, sensible, rational, intelligent) |
| audible(clear, sharp, exact, definite, distinct) |
| austere(adjective, pure, regular, constant, absolute) |
| believable(adjective, sound, sensible, rational, intelligent) |
| beyond doubt(expression, adjective, set, solid, certain) |
| bold(exact, certain, sure, specific, explicit) |
| cerebral(adjective, sound, sensible, rational, intelligent) |