impenetrate /im-penˈi-trāt/

1. To permeate
2. To penetrate thoroughly

impenetrāˈtion noun

• barkeepers
• barkeeps
• barken
• barkened
• barkening
• barkens
• barkentine
• barkentines
• barker
• barkers
• Barker's mill
• barkhan
• barkhans
• barkier
• barkiest
• barking
• barking deer
• barking iron
• barking irons
• barking mad
• barkless
• bark-lice
• bark-louse
• bark-louses
• barks