| positive(adjective, clear, certain, valid, dependable) |
| trusty(adjective, unfailing) |
| acceptable(adjective, dependable, unerring) |
| agreeable(adjective, dependable, unerring) |
| efficient(adjective, dependable, unerring) |
| honest(adjective, unfailing) |
| necessary(adjective, certain, inevitable) |
| safe(adjective, clear, flawless, valid, undoubtable) |
| satisfactory(adjective, dependable, unerring) |
| satisfying(adjective, dependable, unerring) |
| sure-fire(adjective, informal, certain, flawless, dependable) |
| bound(certain, certainty, unquestionable, undisputable) |
| efficacious(adjective, dependable, unerring) |
| handy(adjective, dependable, unerring) |
| helpful(adjective, dependable, unerring) |
| immaculate(complete, perfect, precise, sure, flawless) |
| incontrovertible(adjective, clear, certain, valid, dependable) |
| nice(perfect, precise, flawless, faultless, exquisite) |
| surefire(adjective, certain, reliable, trustworthy, dependable) |
| true(adjective, dependable, unerring) |