arduous /ärˈdū-əs/

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

ardˈuously adverb

• microfarads
• microfauna
• microfelsitic
• microfibre
• microfibres
• microfiche
• microfiched
• microfiche reader
• microfiche readers
• microfiches
• microfiching
• microfilament
• microfilaments
• microfilaria
• microfilariae
• microfilarias
• microfiling
• microfilings
• microfilm
• microfilmed
• microfilming
• microfilm reader
• microfilm readers
• microfilms
• microfinance