arduous /ärˈdū-əs/

1. Steep, difficult to climb
2. Difficult to accomplish
3. Laborious

• rasterizes
• rasterizing
• rasters
• rastrum
• rastrums
• rasure
• rasures
• rat
• rata
• ratabilities
• ratability
• ratable
• ratable value
• ratably
• ratafia
• ratafias
• ratan
• ratans
• rataplan
• rataplans
• rat-arsed
• ratas
• rat-a-tat
• ratatouille
• ratatouilles