Calm; peaceful; gentle — describes a tranquil state, a person's demeanor, or mild weather/sea conditions.
彼女はいつも穏やかな表情をしている。
She always has a calm expression.
今日は穏やかな天気で散歩日和だ。
Today's calm weather makes it perfect for a walk.
海は穏やかで波もほとんどなかった。
The sea was calm with almost no waves.
Moderate; reasonable; amicable — not extreme, showing a conciliatory or mild character or attitude.
交渉は穏やかに進み、両者は合意に達した。
The negotiations proceeded amicably, and both parties reached an agreement.
穏やかな性格の同僚は職場の雰囲気を和らげる。
A colleague with a mild temperament eases the workplace atmosphere.