toil
This word carries a heavy connotation of drudgery and physical exhaustion. It suggests a grinding, repetitive effort that is often oppressive or soul-crushing, rather than a productive or satisfying kind of hard work. It evokes images of sweat, fatigue, and a slow, painful progression toward a goal. As a noun, the word is typically uncountable when referring to the general concept of hard labor. However, it can function as a countable noun when describing a specific, arduous journey or a particular instance of a laborious trek.
Meanings
To work extremely hard for a long period of time, often involving physical exhaustion.
"They toiled in the fields from dawn until dusk."
To work hard and exhaustively to achieve a specific goal or complete a task.
"She toiled over the manuscript for three years before it was finished."
To move slowly and with great effort through a difficult environment or task.
"The hikers toiled through the deep snow to reach the summit."