noun
Refers to physical or mental exertion, often with a sense of hardship or difficulty. Common in formal and written contexts, and in compounds like 労力 (labour), 苦労 (hardship), 労を惜しまない (spare no effort).
彼は労を惜しまずに働いた。
He worked without sparing any effort.
長年の労が実を結んだ。
Years of toil bore fruit.