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.