drudge
A person who does boring, tiring work for a long time.
A drudge is someone who does boring, repetitive, exhausting work, often for long hours with little reward or recognition. The word captures that grinding feeling of tedious labor that never seems to end.
In Charles Dickens's novels, you often meet characters who work as drudges: children forced to labor in factories, clerks copying documents by hand for twelve hours a day, or servants scrubbing floors until their hands are raw. They're stuck doing work that drains them physically and mentally, with no time for rest, learning, or joy.
The word also works as a verb. When you drudge through something, you're forcing yourself through difficult, tiresome work. You might drudge through a mountain of homework or drudge through cleaning out a dusty, cluttered garage on a hot Saturday afternoon.
What makes drudgery so draining is that the work feels endless and meaningless, like you're accomplishing nothing despite all your effort. The work is hard, but more than that, it lacks purpose and variety. A student doing fifty identical math problems might feel like a drudge, while the same student working hard to build a robot feels energized because the work has purpose and variety.
The opposite of drudgery is work that challenges you, teaches you something, or moves you toward a goal you care about.