noun
Refers to objective truth or actual state of affairs. Often used in formal or emphatic contexts.
彼の言葉にはまことがなかった。
There was no truth in his words.
まことのことを言ってください。
Please tell me the truth.
noun
sincerity; honesty; faithfulness
Emphasizes inner genuineness, heartfelt honesty, and loyalty. Common in expressions like 誠を尽くす.
彼は誠をもって人に接する。
He treats people with sincerity.
誠の心があれば、きっと伝わる。
If you have a sincere heart, it will surely get through.
adverb
Dated adverbial use expressing emphasis or affirmation. Now mostly replaced by 本当に or 実に in modern speech, but still seen in formal or literary contexts.
まことにお久しぶりでございます。
It has indeed been a long time.
まことにありがとうございます。
Thank you very much indeed.