arduous /ärˈdū-əs/

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

ardˈuously adverb

• heavy swell
• heavy swells
• heavy water
• heavyweight
• heavyweights
• heavy wet
• Heb.
• hebdomad
• hebdomadal
• hebdomadal council
• hebdomadally
• hebdomadar
• hebdomadaries
• hebdomadars
• hebdomadary
• hebdomader
• hebdomaders
• hebdomads
• Hebe
• heben
• hebenon
• hebenons
• hebens
• hebephrenia
• hebephreniac