duffer¹ /dufˈər/

1. An unskilful or worthless person (informal)
2. A fogey, a useless old fellow (informal)
3. A counterfeit coin
4. An unproductive mine

• unsociable
• unsociableness
• unsociablenesses
• unsociably
• unsocial
• unsocialised
• unsocialism
• unsocialisms
• unsocialities
• unsociality
• unsocialized
• unsocially
• unsocket
• unsocketed
• unsocketing
• unsockets
• unsod
• unsodden
• unsoft
• unsoftened
• unsoftening
• unsoiled
• unsolaced
• unsold
• unsolder