Synonyms

• labour-intensive
• laborious
• labor-intensive
• wearying
• arduous
• hard
• wearing
• plodding
• straining
• laboured
• dragging
• tiring
• labored
• leaden
• operose
• grueling
• backbreaking
• strenuous
• difficult
• punishing
• toilsome
• gruelling
• Sisyphean
• heavy