Sincerity
Truth
adverb, noun
The kanji and the word are exactly the same. That means they share meanings as well.
Sincerity and truth are so important to me that I always keep them inside my coat (まこと). That's where I keep everything that's dearest to me, and what could be more important that sincerity and truth? Where do you keep sincerity and truth? I bet your answer is "my coat" too.
この映画には武士の誠の姿が描かれています。
The film depicts the truth about samurai.
裁判官が彼の心神喪失による刑事責任能力の回避の申し立てを受け入れたことは、誠に遺憾です。
I’m sincerely upset that the judge accepted his plea of not guilty by reason of insanity.