Describes a state of inner calm, free from worry or agitation. Often used when one's mind is settled after anxiety or in a peaceful situation.
Soaking in the hot spring, I felt my heart become calm.
He is always serene; I've never seen him angry.
Standard kanji-kana mixed spelling.
Variant with 穏やか in kana; less common but still used.
Compound of 心 (こころ, 'heart, mind') and 穏やか (おだやか, 'calm, gentle'). The exact historical derivation is uncertain, but the combination transparently means 'calm-hearted'.