1Calm, gentle, and peaceful; free of intensity or agitation — used to describe a person's demeanor or expression, or mild weather and calm seas.
彼はどんな時も穏やかな笑顔を絶やさない。
He always keeps a calm smile, no matter what happens.
今日は風もなく穏やかな一日だった。
Today was a calm day with no wind at all.
穏やかな海を眺めながらコーヒーを飲んだ。
I drank coffee while gazing at the calm sea.
祖母はいつも穏やかな口調で話す。
My grandmother always speaks in a gentle tone.
2Moderate and reasonable, without going to extremes; describes negotiations or resolutions proceeding amicably.
両者は話し合いの末、穏やかな解決に至った。
After discussion, the two parties reached an amicable resolution.
部長は部下の失敗にも穏やかに対応した。
The manager responded calmly and reasonably even to his subordinate's mistake.
もう少し穏やかな言い方をした方がいい。
You should phrase it a bit more moderately.