本ほん当とうにalso: ほんとにほんとうにCommon wordJLPTN5Freq.FrequencyTop 200Meanings1adverbreally; trulyExpresses genuine feeling, strong emphasis, or sincerity. Used in both statements and exclamations.本ほん当とうにありがとう。Thank you so much.それは本ほん当とうにあった話はなしですか。Is that a true story?