真心|まごころmagokoro[2]nakadaka (mid-high)

1. no-adjectivesincerity; true heart; devotion
   彼女かのじょは彼かれに真心まごころこめて感謝かんしゃしました。↗

   She thanked him with all her heart.

• Synonym誠意せいいNeutralSincerity shown through one's actions and attitude, as in 「誠意を示す」; 「真心」 stresses the warm feeling that comes from the heart.
• Synonym誠実せいじつNeutralHonest, trustworthy and responsible — a matter of character; 「真心」 is the heartfelt feeling itself.
• Synonym誠心せいしんWrittenWritten language for sincerity of heart; rare, and 「真心」 is more common and warmer.
• Synonym至誠しせいWrittenWritten and solemn, for utter sincerity; 「真心」 is the everyday word.
• Synonym丹精たんせいNeutralDevoted care and painstaking effort, as in 「丹精込めて」; 「真心」 is the feeling itself.
• Synonym信しんWrittenA written word for good faith, trustworthiness and faith; 「真心」 focuses on heartfelt feeling.
• Synonym赤心せきしんWrittenWritten language with a tinge of loyalty and devotion; 「真心」 is broader in use.
• Synonym赤誠せきせいWrittenWritten and rare, for utter sincerity; 「真心」 is the more common choice.
• Synonym至心ししんWrittenWritten, rare and Buddhist in flavor; 「真心」 is more everyday and warmer.
• Related誠まことWrittenSincerity and good faith with an archaic, literary air; 「真心」 is more everyday and warmer.
• Related真面目まじめNeutralSeriousness and earnestness — a matter of attitude; 「真心」 is about genuine feeling.
• Related実じつWritten「実」 in formal prose also means truth and reality, what is certain; 「真心」 focuses on heartfelt feeling.
• Related正直しょうじきNeutralHonesty in the sense of never lying; 「真心」 is the warm feeling that comes from within.
• Related本気ほんきNeutralBeing in earnest, with no joking about it; 「真心」 is about genuine feeling.
• Related実直じっちょくWrittenA written word for an honest, upright, dutiful character; 「真心」 is heartfelt feeling.
• Related忠誠ちゅうせいNeutralLoyalty, typically toward a superior or one's country; 「真心」 is broader.
• Related実意じついWrittenWritten and rare, for true, sincere intent; in ordinary use say 「真心」 or 「誠意」.
• Related信実しんじつWrittenWritten and rare, for honesty; 「真心」 is the more common word.
• Related真情しんじょうWrittenTrue feeling with an overtone of deep emotion; close to 「真心」 but more written in register.
• Related真正直ましょうじきNeutralUtterly honest, holding nothing back; rare, while 「真心」 stresses feeling that comes from the heart.
• Antonym偽りいつわりWrittenWritten-style word for lies and falsehood; the direct opposite of the genuine feeling of 「真心」.
• Antonym欺きNeutralDeceiving and tricking people; the opposite of the sincere heart of 「真心」.

Choose 「真心」 for warm, genuine feeling straight from the heart, as in 「真心を込める」 or 「真心のこもった料理」. For sincerity shown through actions say 「誠意」; for an honest, trustworthy character 「誠実」; for loyalty 「忠誠」; for the opposite, lies, 「偽り」. 「誠心」「至誠」「赤心」「赤誠」「至心」「実意」「信実」 and 「信」 are written or rare alternatives, while 「真面目」「本気」 and 「正直」 stress attitude and honesty rather than warmth.

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

1. 偽いつわりや飾かざりのない心こころ。
2. 親身しんみになって尽つくそうとする気持きもち。