1. certain ::
tiyak
2. incontestable ::
hindi matutulan
3. indisputable ::
hindi mapag-aalinlanganan
4. indubitable ::
sigurado
5. sure ::
sigurado
6. undeniable ::
hindi maikakaila
7. undoubted ::
hindi pinag-aalinlanganan
8. unquestionable ::
hindi mapag-aalinlanganan