impenetrable /im-penˈi-trə-bl/

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

impenetrabilˈity noun

impenˈetrably adverb

• myrmecophilous
• myrmecophily
• Myrmidon
• myrmidonian
• Myrmidons
• myrmidons of the law
• myrobalan
• myrobalans
• myrrh
• myrrhic
• myrrhine
• myrrhol
• myrrhols
• myrrhs
• Myrtaceae
• myrtaceous
• myrtle
• myrtles
• myrtle-wax
• Myrtus
• myself
• mysophobia
• mysophobias
• mystagogic
• mystagogical