| well-founded(good, sound, right, reasonable, rational) |
| arguable(adjective, sound, reasonable, sensible, rational) |
| cogent(sound, reasonable, solid, rational, realistic) |
| justifiable(adjective, sound, reasonable, sensible, rational) |
| legitimate(good, sound, correct, right, real) |
| logical(adjective, good, sound, right, reasonable) |
| persuasive(adjective, good, sound, right, reasonable) |
| secure(adjective, open, sound, reasonable, solid) |
| sincere(adjective, close, correct, true, realistic) |
| smooth(reasonable, influential, winning, convincing) |
| specious(adjective, reliable, probability) |
| unquestionable(adjective, correct, reasonable, real, genuine) |
| well-grounded(good, sound, right, reasonable, rational) |
| accurate(adjective, close, open, direct, sound) |
| admissible |
| apt(adjective, reasonable, fair, acceptable, expected) |
| authoritative(adjective, open, honest, sensible, true) |
| bona fide(expression, adjective, good, sound, genuine) |
| compelling(adjective, sound, reasonable, rational, realistic) |
| determinative(adjective, sound, reasonable, rational, convincing) |