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

• tithonia
• titi
• titi family
• titi monkey
• Titian
• titillate
• titillated
• titillating
• titillation
• titivate
• titivation
• titlark
• title
• title bar
• title deed
• title of respect
• title page
• title role
• title-holder
• titled
• titler
• titmouse
• Tito
• titrate
• titration