arduous /ärˈdū-əs/

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

• piacularity
• pia desideria
• piaffe
• piaffed
• piaffer
• piaffers
• piaffes
• piaffing
• pia fraus
• pia mater
• pia maters
• pianette
• pianettes
• piani
• pianino
• pianinos
• pianism
• pianisms
• pianissimo
• pianissimos
• pianississimo
• pianist
• pianiste
• pianistic
• pianistically