arduous /ärˈdū-əs/

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

ardˈuously adverb

• vivdas
• vive
• vively
• vivencies
• vivency
• viver
• Viverra
• Viverras
• viverrid
• Viverridae
• viverrids
• Viverrinae
• viverrine
• vivers
• vives
• vivi-
• vivianite
• vivianites
• vivid
• vivider
• vividest
• vividities
• vividity
• vividly
• vividness