idioglossia /id-i-ō-glosˈi-ə/

1. A condition in which pronunciation is so bad as to be quite unintelligible
2. A private language developed between two or more children, esp twins, etc

• quickstepped
• quickstepping
• quicksteps
• quick-stick
• quick-sticks
• quick-tempered
• quickthorn
• quickthorns
• quick time
• quick times
• quick trick
• quick tricks
• quick-water
• quick-witted
• quick-wittedness
• quicky
• quid
• quidam
• quidams
• quiddanies
• quiddany
• quiddit
• quidditative
• quidditch
• quidditches