toiling

(verb) work hard. Synonyms: labor, labour, toil, fag, travail, grind, drudge, dig, moil. Examples: "She was digging away at her math homework." "Lexicographers drudge all day long."

(adj) doing arduous or unpleasant work. Synonyms: drudging, laboring, labouring. Examples: "Drudging peasants." "The bent backs of laboring slaves picking cotton." "Toiling coal miners in the black deeps."