Unfailing; infallible.
Known but not specifically named; indeterminate; indefinite; one or some; sometimes used independently as a noun, and meaning certain persons; see also "one".
Fixed or stated; regular; determinate.
Not to be doubted or denied; established as a fact.
Sure, positive, not doubting.
Actually existing; sure to happen; inevitable.
Unnamed or undescribed members (of).
Having been determined but not specified.
An affirmative reply; yes; certainly.
A polite reply to thank you.
That which is certain.