| conclusive(adjective, sound, reasonable, solid, rational) |
| incontestable(adjective, ideal, all time, the best) |
| irrefragable(adjective, ideal, all time, the best) |
| rational(adjective, clear, sound, reasonable, sensible) |
| sure(adjective, ideal, all time, the best) |
| ultimate(adjective, ideal, all time, the best) |
| unanswerable(adjective, ideal, all time, the best) |
| undeniable(adjective, ideal, all time, the best) |
| unquestionable(adjective, ideal, all time, the best) |
| well-founded(adjective, good, sound, correct, reasonable) |
| just(adjective, good, sound, correct, reasonable) |
| mighty(adjective, strong, great, energetic, violent) |
| momentous(adjective, energetic, significant, effective, forceful) |
| puissant(adjective, clear, strong, power, energetic) |
| reasonable(adjective, sound, correct, reasonable, sensible) |
| satisfactory(adjective, good, clear, reasonable, sensible) |
| sensible(adjective, good, clear, sound, reasonable) |
| significant(adjective, sharp, energetic, short, compact) |
| vigorous(adjective, strong, energetic, violent, powerful) |
| capable(adjective, strong, power, energetic, vigorous) |