pre-noun adjectival
Pre-noun adjectival form of 信ずる (classical equivalent of 信じる), meaning 'should be trusted' or 'worthy of belief'. Used before nouns to describe a person, source, or information that is credible.
彼は信ずべき友人だ。
He is a trustworthy friend.
この情報は信ずべき筋からのものだ。
This information comes from a reliable source.