New American Oxford Dictionary
back-breaking
back-break ing |bæk breɪkɪŋ |(also backbreaking ) ▶adjective [ attrib. ] (esp. of manual labor ) physically demanding: a day's back-breaking work.
Oxford Dictionary
back-breaking
back-breaking ▶adjective (of manual labour ) physically demanding: a day's back-breaking work.
American Oxford Thesaurus
back-breaking
back-breaking adjective shoveling wet snow is back-breaking work: grueling, arduous, strenuous, onerous, punishing, crushing, demanding, exacting, taxing, exhausting, draining; informal killing; archaic toilsome. ANTONYMS easy.
Oxford Thesaurus
back-breaking
back-breaking adjective a back-breaking task: gruelling, arduous, strenuous, onerous, punishing, murderous, crushing, Herculean, demanding, exacting, taxing, formidable, exhausting, draining, laborious, burdensome, tough, stiff, uphill, heavy; informal killing; Brit. informal knackering; archaic toilsome. ANTONYMS easy, effortless.