pre-noun adjectival
certain; definite; clear; credible
Pre-noun adjectival (rentaishi) used in formal or written contexts to emphasize that something is unquestionable, reliable, or firmly established. Often modifies nouns like 証拠 (evidence), 事実 (fact), or 根拠 (grounds).
See also: 確 (かく)
Because there was no definite evidence, the indictment was deferred.
His claim lacks clear grounds.