Usage patterns
気楽に〈動詞〉to do something in a relaxed, worry-free way
Please feel free to speak without worrying.
気楽な〈人〉an easygoing, laid-back person
He's an easygoing guy, so he doesn't worry about small details.
気楽に構えるto take a relaxed, unworried attitude toward things
No matter what happened, he stayed relaxed about it.
気楽な気持ちで〈動詞〉with an easy, unworried mindset
I took the exam with a relaxed frame of mind.