impenetrable /im-penˈi-trə-bl/

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

• bassets
• bass fiddle
• bass fiddles
• bass guitar
• bass guitars
• bass horn
• bass horns
• bassi
• bassier
• bassiest
• bassinet
• bassinets
• bassing
• bassist
• bassists
• bassline
• basslines
• basso
• bassoon
• bassoonist
• bassoonists
• bassoons
• basso profondo
• basso profundo
• basso profundos