A formal noun emphasizing moral integrity, trustworthiness, and keeping one's word, often in relationships, contracts, or ethical contexts.
He is a person who values good faith.
Contracts should be made based on good faith.
The merchant kept faith with his business partner.
That act goes against the principle of good faith.
He is a person who values good faith above all else.
背信 means an act of betrayal or breach of faith, the direct opposite of 信義, which is the virtue of remaining faithful and honoring one's word.
A Sino-Japanese compound of 信 (trust, faith) and 義 (righteousness, justice), conveying the idea of righteous trustworthiness.