訓 おだ(やか) ・ 音 オン
漢越音: ổn
The grain radical 禾 hints at a full granary, which keeps the mind calm and settled; its reading on means stable, as in a stable life.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
彼は穏やかな人です。 (かれはおだやかなひとです)
He is a calm person.