Having been determined but not specified.
Unnamed or undescribed members (of).
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.
"whatever happens, happens" (more literally "whatever will be, will be") Ostensibly employed to express a personal philosophy of fatalism and acceptance of the future.