誠実な（せいじつな、seijitsuna）
- sincere

The Japanese word 誠実な (せいじつな) means "sincere," "honest," "faithful," "integrity," or "genuine." It describes a person's character or behavior that is characterized by truthfulness, trustworthiness, and a strong moral compass. It implies a sense of doing the right thing, even when no one is watching. The word emphasizes qualities like being reliable, dependable, and acting with good intentions. 誠実な can also describe actions or things that are done or made with honesty and care.

⚫︎ 彼は誠実な人です。 Translation: He is an honest person. ⚫︎ 彼女は仕事に誠実な態度で臨みました。 Translation: She approached the work with a sincere attitude. ⚫︎ 誠実な対応をしてくれて、ありがとう。 Translation: Thank you for your honest/sincere response.

You can use 誠実な to describe someone's personality, behavior, or attitude. It’s frequently used when talking about business relationships, personal relationships, or any situation where trust is important. It's often used to commend someone for their actions. You can use it to describe a person, their actions, their feelings, or even a product (meaning it is made with integrity or care). Be mindful to use it appropriately.

誠実な is typically written with the kanji 誠 (sei), which means "sincerity" or "honesty," and the adjective ending な (na). The reading in hiragana is せいじつな. There are no other common ways to write this word, and the okurigana (the suffix hiragana) is always な.

⚫︎ 正直な (しょうじきな) - honest, straightforward ⚫︎ 真面目な (まじめな) - serious, diligent, earnest ⚫︎ 素直な (すなおな) - obedient, compliant, straightforward, honest ⚫︎ 真摯な (しんしな) - sincere, earnest, dedicated (This is a slightly more formal and often used in writing)

⚫︎ 不誠実な (ふせいじつな) - insincere, dishonest, untruthful ⚫︎ 不正直な (ふしょうじきな) - dishonest ⚫︎ 不実な (ふじつな) - disloyal, faithless

彼は誠実な人で、いつも約束を守ります。 ・Translation: He is an honest person and always keeps his promises. ・Explanation: This sentence describes a person's character, highlighting their honesty and reliability.

誠実な対応をすることで、お客様からの信頼を得ることができました。 ・Translation: We were able to gain the trust of our customers by providing an honest/sincere response. ・Explanation: This sentence focuses on the result of acting with integrity and building trust in a business context.

The word 誠実 (seijitsu) is composed of the kanji 誠 (sei), meaning "sincerity," "truth," or "fidelity," and 実 (jitsu), meaning "truth," "reality," or "fruit." The adjective suffix な (na) is added to make the word an adjective. Therefore, the word 誠実な literally means "truthful" or "full of truth."