exhausting · hard · tough · arduous · to work hard · to go to a lot of trouble · hardship(s)

John, you're working too hard. Sit down and take it easy for a while.

Japanese office workers work very hard.

I don't like anything like hard work.

You don't have to work so hard.

It drew strength from the young people who rejected the myth of their generation's apathy, who left their homes and their families for jobs that offered little pay and less sleep.