何かあれば、気軽に声をかけてください。
If anything comes up, feel free to let me know.
このカフェは一人でも気軽に入れる雰囲気だ。
This café has the kind of atmosphere where you can casually drop in even on your own.
彼は頼まれると何でも気軽に引き受けてしまう。
Whenever he's asked, he readily takes on anything without a second thought.
週末は気軽な服装でお越しください。
Please come in casual clothes on the weekend.