1. Characterized by effort to the point of exhaustion; especially physical effort
   - arduous, backbreaking, grueling [US], gruelling [Brit, Cdn], hard, heavy, laborious, punishing, toilsome

See also: effortful, operoseness

• overleap
• overlie
• overlip
• overload
• overloaded
• overlong
• metalhead
• metalise
• metalize
• metalled road
• metallic
• metallic bond
• metallic element
• metallic-colored
• metallic-coloured
• metallic-looking
• metalliferous
• metallike
• metallise
• metallised dye
• metallize
• metallized dye
• metallographic
• metallography
• metalloid