in all sincerity; truthfully; honestly
Emphatic adverbial phrase expressing genuine feeling or truthfulness, stronger than まことに alone.
See also: 誠に
誠にもって申し訳ございません。
I am truly very sorry.
まことにもってありがたいお話です。
It is a truly appreciated offer.
Standard kanji spelling using 誠, the most common kanji for まこと.
Alternate kanji spelling using 実; less common than 誠にもって.
Rare kanji spelling using 真; may be encountered in older texts.
Derived from まことに (truly) with the emphatic particle もって added for intensification.