noun
sincerity; true heart; devotion
Formal or literary term for a sincere, devoted heart; often used in elevated or written contexts.
彼の赤心に満ちた言葉に、皆が心を打たれた。
Everyone was moved by his words filled with sincerity.
赤心をもって人に接することが大切だ。
It is important to interact with people with a true heart.