certain

(noun): (with "the") Something certain.
(adjective): Sure, positive, not doubting.
(adjective): Determined; resolved.
(adjective): Not to be doubted or denied; established as a fact.
(adjective): Actually existing; sure to happen; inevitable.
(adjective): Unfailing; infallible.
(adjective): I have often wished , that I knew so certain a remedy in any other disease
(adjective): Fixed or stated; regular; determinate.
(adjective): Known but not specifically named; indeterminate; indefinite; one or some; sometimes used independently as a noun, and meaning certain persons; see also "one".
(pronoun): (with of) Unnamed or undescribed members (of).