Synonyms for certain

Some common synonyms of certain are: certain [a.] 1. Indubitable, unquestionable, indisputable, undeniable, incontestable, incontrovertible, unquestioned, undisputed, undoubted, absolute, positive, plain, sure, past dispute, beyond all question, clear as day. 2. Sure, assured, confident, undoubting, fully convinced. 3. Unfailing, infallible, never-failing. 4. Actual, real, existing. 5. Settled, determinate, fixed, stated, constant. 6. Known but unnamed, sort or, some, indeterminate.