na-adjective, noun
Formal term describing a person or attitude that is meticulously honest, upright, and careful in conduct. Often used in written or formal contexts.
彼は謹直な性格で、誰からも信頼されている。
He has a conscientious character and is trusted by everyone.
謹直に業務を遂行する。
Carry out one's duties scrupulously.