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

See also: effortful, toilsomeness

• imaginatively
• imaginativeness
• imagine
• imaging
• imaginings
• imagism
• imago
• imam
• Imamu Amiri Baraka
• imaret
• imaum
• Imavate
• imbalance
• imbalanced
• imbauba
• imbecile
• imbecilic
• imbecility
• imbed
• imbibe
• imbiber
• imbibing
• imbibition
• imbricate
• imbricated