| sure(adjective, test, expert, reliable) |
| absolute(adjective, true) |
| authoritative(adjective, sound, reasonable, solid, proper) |
| certain(adjective, set, true, definite, sure) |
| definite(adjective, certain, true, sure, obvious) |
| documented(verb, adjective, evinced, evidential) |
| evident(set, certain, definite, demonstration, unquestionable) |
| exemplified(verb, adjective, evinced, evidential) |
| exhibited(verb, adjective, evinced, evidential) |
| factual(adjective, firm, solid, true, accurate) |
| irrefutable(adjective, sound, reasonable, certain, rational) |
| prove |
| strong(adjective, sound, reasonable, rational) |
| testified(verb, adjective, evinced, evidential) |
| tried-and-true(adjective, test, expert, reliable, tested) |
| valid(adjective, good, sound, right, reasonable) |
| vouched(verb, adjective, evinced, evidential) |
| well-founded(adjective, sound, reasonable, rational, logical) |
| well-tried(adjective, test, expert, reliable) |
| witnessed(verb, adjective, evinced, evidential) |