Diligently; doing something steadily and industriously, often with persistent effort.
彼は毎日せっせと店の掃除をしている。
He diligently cleans the shop every day.
せっせと貯金して、いつか家を買いたい。
I'm saving diligently; I want to buy a house someday.
子どもたちはせっせと宿題を片付けた。
The children industriously finished their homework.
年配の女性がせっせと編み物をしていた。
An elderly woman was busily knitting.