na-adjective, noun
Describes a person, expression, or atmosphere that is serious, strict, and dignified, often with a sense of formality or moral uprightness. Slightly literary.
彼の謹厳な態度に、周囲は緊張した。
His stern demeanor made everyone around him tense.
謹厳実直な人柄で知られている。
He is known for his solemn and upright character.