| established(verb, adjective, approved, confirmed, endorsed) |
| confirmed(verb, adjective, certain, substantial, real) |
| corroborated(verb, adjective, substantiated, affirmed) |
| factual(adjective, accurate) |
| proven(verb, adjective, substantiated, proved, ascertained) |
| substantiated(verb, adjective, truth, ascertained) |
| valid(adjective, accurate) |
| certified(verb, adjective, affirmed, proved, ascertained) |
| proved(verb, substantiated, proved, ascertained, experimented) |
| actual(adjective, true, real, genuine, authentic) |
| true(adjective, certain, substantial, real, genuine) |
| authentic(adjective, accurate) |
| ascertained(verb, proved, ascertained) |
| attested(verb, affirmed) |
| authoritative(adjective, accurate, valid) |
| checked(verb, examined, ascertained, experimented) |
| demonstrated(verb, proved, ascertained) |
| official(adjective, accurate) |
| supported(verb, substantiated, affirmed) |
| tested(verb, experimented) |