noun, adverb
one's leisure hours; free time
Often used adverbially as 暇々に meaning 'in one's spare time' or 'when one has free time'. Can also be used as a noun referring to leisure hours.
暇々に読書を楽しむ。
I enjoy reading in my spare time.
彼は暇々を見つけては釣りに行く。
He goes fishing whenever he finds some free time.
暇 is the more common word for 'free time' or 'leisure'. 暇々 emphasizes the idea of 'spare moments' or 'leisure hours' and is often used in the adverbial phrase 暇々に.
Reduplication of 暇 (ひま, 'free time, leisure') for emphasis, meaning 'spare moments' or 'leisure hours'.