怠惰は悪徳のもと。

Idle hands are the devil's tool.

その人は慎み深いのか、それとも怠惰なのかと人は思うだろう。

They would think the person is modest or lazy.

高校時代からつきあっている彼氏はいるものの、つきあいが惰性になっていると感じ、不満をつのらせている。

She has a boyfriend she's been going out with since high school but feels their relationship has become a matter of habit and is increasingly dissatisfied.

彼は怠惰で無責任だった。結局、彼は退社を命じられた。

He was lazy and irresponsible. Thus, he was told to leave the company.

惰性に身を任せているがために今のような現在があるんですね。

I've ended up in my present state from having indulged myself.

怠惰は弱気精神の避難場にすぎない。

Idleness is only the refuge of weak minds.