arduous /ärˈdū-əs/

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

• gang-bangs
• gangboard
• gangboards
• gangbuster
• gangbusters
• gangbusting
• gangbustings
• gang-bye
• gang-byes
• Gang Days
• ganged
• ganger
• gangers
• ganging
• gangings
• gangland
• ganglands
• ganglia
• gangliar
• gangliate
• gangliated
• gangliform
• gangling
• ganglion
• ganglionic