back-breaking
adjective
• (of manual labour) physically demanding.
• "a day's back-breaking work"
Similar:
gruelling,
arduous,
strenuous,
onerous,
punishing,
murderous,
crushing,
Herculean,
demanding,
exacting,
taxing,
formidable,
exhausting,
draining,
laborious,
burdensome,
tough,
stiff,
uphill,
heavy,
killing,
knackering,
toilsome,
