| experimental(adjective, fresh, tentative, probationary, exploratory) |
| first-hand(inchoate, originating) |
| first stage(expression, adjective, fresh, tentative, probationary) |
| incepted(inchoate, originating) |
| inchoate |
| not final(expression, adjective, tentative, probationary, exploratory) |
| not settled(expression, adjective, tentative, probationary, exploratory) |
| on approval(expression, adjective, fresh, tentative, probationary) |
| open for consideration(expression, adjective, idiom, tentative, probationary) |
| originating |
| parenthetical |
| probationary(adjective, fresh, tentative, exploratory, inchoate) |
| provisionary(adjective, tentative, probationary, exploratory) |
| start |
| tentative(adjective, probationary, exploratory) |
| tester(adjective, fresh, coming, tentative, maturing) |
| transitional(adjective, tentative, probationary, exploratory) |
| trial-and-error(adjective, fresh, tentative, probationary, exploratory) |
| unconcluded(adjective, fresh, tentative, probationary, exploratory) |
| unconfirmed(adjective, tentative, probationary, exploratory) |