1. The quality of being impenetrable (by people or light or missiles etc.)
   - imperviousness 
2. Incomprehensibility by virtue of being too dense to understand
   - impenetrableness

Derived forms: impenetrabilities

See also: impenetrable

Type of: incomprehensibility, quality

Antonym: penetrability

Encyclopedia: Impenetrability

• unseasonable
• unseasonableness
• unseasonably
• unseasoned
• unseat
• unseaworthy
• unsectarian
• unsecure
• unsecured
• unsecured bond
• unseductive
• unseeable
• unseeded
• unseeing
• unseeingly
• unseemliness
• unseemly
• unseen
• unsegmented
• unsegregated
• unselected
• unselective
• unselfconscious
• unselfconsciously
• unselfconsciousness