本当に (ほんとうに)really; truly

本当に, its kanji, and other words that share them.Open this graph

Kanji in 本当に

基本きほんbasics; fundamentals
日本人にほんじんJapanese person; Japanese people
本社ほんしゃhead office; main office
本部ほんぶheadquarters; head office
日本語にほんごJapanese (language)
本人ほんにんthe person in question; the person themselves
本会議ほんかいぎplenary session; regular session
本塁打ほんるいだhome run
当初とうしょbeginning; start
当局とうきょくauthorities; relevant authorities
当時とうじat that time; in those days
当選とうせんbeing elected
当面とうめんcurrent; urgent
担当たんとうbeing in charge (of an area of responsibility); being responsible (for a work role, etc.)
本当ほんとうtruth; reality
当然とうぜんnatural; right

See how 本当に connects to the rest of Japanese.