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

• Laudo
• laugh
• laugh at
• laugh away
• laugh line
• laugh loudly
• laugh off
• laugh softly
• laugh track
• laughable
• laughableness
• laughably
• laugher
• laughing
• laughing gas
• laughing gull
• laughing hyena
• laughing jackass
• laughing owl
• laughingly
• laughingstock
• laughter
• laughter line
• Laughton
• lauhala