誠意|せいいseii[1]atamadaka (head-high)

1. nounsincerity; good faith
   彼かれは無礼ぶれいにも私の誠意せいいを疑うたがった。↗

   He dared to doubt my sincerity.

• Synonym誠心せいしんWrittenWritten/formal word for sincerity of heart; 「誠意」 is mostly used for the attitude shown toward others, as in 「誠意を示す」.
• Synonym誠実せいじつNeutralHonesty as a trait of a person's character; 「誠意」 is the good faith concretely shown in one's actions.
• Synonym真心まごころNeutralA native Japanese word for a true heart, with a warm, tender nuance; 「誠意」 leans toward sincerity in a moral sense.
• Synonym至誠しせいWrittenWritten/formal word for utter, wholehearted sincerity; 「誠意」 is the more everyday word.
• Synonym信しんWrittenA single-character written/formal word for trustworthiness and trust; 「誠意」 is good faith.
• Synonym実意じついWrittenWritten/formal word for one's true heart or thoughtfulness; 「誠意」 is more commonly used.
• Synonym信実しんじつWrittenWritten/formal word for honesty without deceit; 「誠意」 stresses the attitude one takes toward other people.
• Synonym真情しんじょうWrittenWritten/formal word for genuine, unfeigned feelings; 「誠意」 leans toward moral good faith.
• Synonym赤誠せきせいWrittenWritten/formal word for utter devotion and loyalty of heart; 「誠意」 is the more everyday word.
• Synonym至心ししんWrittenRare written/formal word for a true heart; in daily use say 「誠意」 or 「真心」.
• Related誠まことWrittenWritten/formal word for truth and sincerity, as in 「誠の心」; 「誠意」 stresses the attitude shown toward others.
• Related実じつNeutralThe same word; as the adverb 「誠に」 it means truly, as in 「誠に申し訳ない」. 「誠意」 is a noun meaning good faith.
• Related正直しょうじきNeutralHonesty and frankness, common in both speech and writing; 「誠意」 is the good faith shown toward others.
• Related本気ほんきNeutralBeing serious rather than joking, as in 「本気で怒る」; 「誠意」 is good faith toward others.
• Related真面目まじめNeutralSerious and honest, as in 「真面目な人」; 「誠意」 is the good faith shown toward others.
• Related熱心ねっしんNeutralEnthusiastic, eager dedication, as in 「仕事に熱心」; 「誠意」 is good faith toward others.
• Related善意ぜんいNeutralGood will that considers the other person's benefit; in law it also means lacking knowledge of the facts. 「誠意」 is a sincere, responsible attitude.
• Related忠誠ちゅうせいNeutralLoyalty and devotion, as in 「忠誠を誓う」; 「誠意」 is sincerity in dealing with people.
• Related実直じっちょくWrittenA written/formal word for an honest, steady, dutiful character, as in 「実直な人柄」; 「誠意」 is sincerity shown toward others.
• Related丹精たんせいNeutralDevoting painstaking care and effort, as in 「丹精込めて育てる」; 「誠意」 is good faith toward others.
• Related真率しんそつWrittenWritten/formal word for frank, straightforward sincerity; 「誠意」 stresses being sincere toward people.
• Related丹心たんしんWrittenWritten/formal word for devoted loyalty of heart; in everyday speech say 「誠意」.
• Related衷情ちゅうじょうWrittenWritten/formal word for one's innermost true feelings, as in 「衷情を訴える」; 「誠意」 is about one's attitude.
• Related篤実とくじつWrittenWritten/formal word for warm-hearted, honest character, as in 「温厚篤実」; 「誠意」 is about one's attitude.
• Antonym不誠実ふせいじつNeutralInsincerity or dishonesty — the direct opposite of 「誠意」.

Use 「誠意」 for the good faith you show toward others, as in 「誠意ある対応」. For a person's honest character say 「誠実」, for a warm true heart 「真心」, for being serious 「本気」; the opposite is 「不誠実」. 「誠心」「至誠」「実意」「信実」「真情」「赤誠」「至心」「誠」「真」「真率」「丹心」「衷情」「篤実」「実直」 and 「信」 are written or formal alternatives; 「正直」 is everyday honesty, 「熱心」 enthusiasm, 「善意」 good will, 「忠誠」 loyalty and 「丹精」 devoted care.

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

1. 私利しりを捨すてて、自分じぶんの良心りょうしんのままに物事ものごとに当あたる気持きもち。