impenetrable /im-penˈi-trə-bl/

1. Incapable of being penetrated
2. Impervious
3. Inscrutable
4. Occupying space exclusively (physics)

impenetrabilˈity noun

• profluences
• profluent
• Pr. of Man.
• pro forma
• pro-forma
• profound
• profounder
• profoundest
• profoundly
• profoundness
• profoundnesses
• profounds
• profs
• profulgent
• profundities
• profundity
• profuse
• profusely
• profuseness
• profusenesses
• profuser
• profusers
• profusion
• profusions
• prog