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

See also: effortful

• Oven Stuffer Roaster
• oven thermometer
• oven-ready
• oven-shaped
• ovenbake
• ovenbird
• ovenware
• over
• over again
• over and over
• over and over again
• over here
• over my dead body
• over the counter security
• over the counter stock
• over-correct
• over-crowding
• over-egg
• over-embellished
• over-the-counter
• over-the-counter drug
• over-the-counter market
• over-the-counter medicine
• over-the-hill
• over-the-shoulder bombing