noun
happy-go-lucky person; easygoing and indifferent person
Describes someone who is carefree, optimistic, and not easily bothered by details; can carry a slightly negative nuance of being too laid-back or indifferent. Often used in casual conversation.
See also: 極楽蜻蛉
彼は気楽トンボで、いつも笑っている。
He's a happy-go-lucky guy and is always smiling.
あの気楽トンボには、締め切りなんて気にしない。
That easygoing person doesn't care about deadlines.
Compound of 気楽 (carefree) and トンボ (dragonfly), likely from the image of a dragonfly flitting about without a care. The exact origin is uncertain.