► 副詞誠に [まことに] [liter] [polite]
meaning: true rank: 2☆ 誠に
申し
訳有りません ⇨ I truly regret it. I sincerely apologize
More examples:- 多大な御支援頂き誠に有難うございます ⇨ I’d like to thank for a lot of the support that I have received
- 御褒めに与り誠に光栄であります ⇨ It is an honor to receive such praise