arduous /ärˈdū-əs/

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

ardˈuously adverb

ardˈuousness noun

• red-looked
• redly
• red-mad
• red man
• red meat
• red meats
• red men
• red mist
• red mists
• red moki
• red mud
• red mullet
• red-murrain
• redneck
• rednecks
• redness
• rednesses
• redo
• redoes
• redoing
• redolence
• redolences
• redolencies
• redolency
• redolent