arduous /ärˈdū-əs/

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

ardˈuously adverb

ardˈuousness noun

• Euraquilo
• Eurasia
• Eurasian
• Euratom
• eureka
• eurekas
• eurhythmic
• eurhythmical
• eurhythmics
• eurhythmies
• eurhythmist
• eurhythmists
• eurhythmy
• euripi
• euripus
• euripuses
• euro
• Euro-
• Euro-American
• euro area
• euro areas
• Eurobabble
• Eurobond
• Eurocentric
• Eurocentricity