A lazy person; someone who habitually avoids work or effort (often carries a mildly critical nuance).
彼は学生時代からの怠け者で、宿題はいつも最後にやる。
He's been lazy since his school days and always does his homework at the last minute.
怠け者にならないように、毎朝小さな目標を立てている。
To avoid being lazy, I set small goals each morning.
親は子どもに『怠け者になるな』とよく言う。
Parents often tell their children, 'Don't be lazy.'