信|しんshin[1]atamadaka (head-high)

1. nounhonesty; sincerity; fidelity
2. nountrust; reliance; confidence
3. noun(religious) faith; devotion
4. countercounter for received messages

• Synonym誠まことNeutralTruth and sincerity of heart; also an adverb meaning 'truly', as in 「誠に」. 「信（しん）」 centers on keeping promises and being worthy of trust.
• Synonym信用しんようNeutralTrust or creditworthiness of a person or institution; also buying on credit, as in 「信用取引」. 「信」 is about integrity itself.
• Synonym信頼しんらいNeutralFirm belief that someone can be relied on, as in 「信頼関係」. 「信」 leans written/formal and stresses integrity.
• Synonym忠誠ちゅうせいWrittenWritten/formal prose: loyalty to a lord, nation, or organization, as in 「忠誠を誓う」. 「信」 is about keeping one's word and honesty.
• Synonym実じつNeutralSame word as 「誠」 above (variant writing 実): truth and sincerity of heart.
• Synonym正直しょうじきNeutralHonest and frank, never lying. 「信」 is about keeping promises and being reliable.
• Synonym誠意せいいNeutralGood-faith intent shown to others, as in 「誠意を示す」. 「信」 stresses keeping one's word.
• Synonym誠実せいじつNeutralAn honest, dependable character, as in 「誠実な人柄」. 「信」 leans written/formal, covering trustworthiness and faith.
• Synonym信義しんぎWrittenWritten/formal prose for good faith and honoring agreements, as in 「信義を重んじる」. Very close in sense to 「信」.
• Synonym誠心せいしんWrittenWritten/formal prose: wholehearted sincerity, as in 「誠心誠意」. 「信」 stresses keeping promises and faith.
• Synonym忠義ちゅうぎWrittenLoyalty unto one's lord, with a samurai-era flavor. 「信」 is about keeping one's word.
• Synonym実直じっちょくNeutralHonest, earnest and scrupulous, as in 「実直な職人」. 「信」 stresses keeping promises.
• Synonym真心まごころNeutralA true, unfeigned heart, as in 「真心を込める」. 「信」 is about trustworthiness.
• Synonym至誠しせいWrittenWritten/formal prose for utmost sincerity, as in 「至誠天に通ず」. 「信」 stresses keeping one's word.
• Synonym確信かくしんNeutralFirm conviction that something is true, as in 「確信を持つ」. 「信」 is about trustworthiness and faith.
• Synonym信実しんじつWrittenWritten/formal prose: honesty and sincerity; in everyday speech use 「誠実」. 「信」 covers trustworthiness and faith.
• Synonym丹心たんしんWrittenWritten/formal prose, mostly in classical texts: utter devotion. 「信」 stresses keeping one's word.
• Synonym篤実とくじつWrittenWritten/formal prose: sincere and warmhearted, as in 「篤実な人」. 「信」 covers trustworthiness and faith.
• Synonym赤心せきしんWrittenWritten/formal prose, mostly in classical texts: pure devotion and loyalty. 「信」 covers trustworthiness and faith.
• Synonym赤誠せきせいWrittenWritten/formal prose: utter sincerity, as in 「赤誠を披瀝する」. 「信」 stresses keeping promises.
• Related真情しんじょうWrittenTrue, unfeigned feelings, as in 「真情を吐露する」. 「信」 is about keeping promises.
• Antonym疑ぎWrittenThe opposite of 「信」 in believing versus doubting: doubt and distrust.
• Antonym不信ふしんNeutralThe opposite of 「信」 in believing versus doubting: distrust and dishonesty.

In written or formal prose, 「信」 expresses integrity and faith, as in 「信を置く」 and 「信を問う」. For trust or credit use 「信用」, for reliance 「信頼」, for honesty 「誠実」 or 「正直」, for a sincere heart 「真心」. The opposites are 「不信」 and 「疑」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 約束やくそくなどをまもりとおすこと。信頼しんらい。信任しんにん。