impenetrable /im-penˈi-trə-bl/

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

impenetrabilˈity noun

• squanderers
• squandering
• squanderingly
• squanderings
• squandermania
• squandermanias
• squanders
• square
• square accounts
• square away
• square B
• square-bashing
• square bracket
• square brackets
• square-built
• square centimetre
• square-cut
• squared
• square dance
• square-dance
• square danced
• square-danced
• square dances
• square-dances
• square dancing