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adamant any extremely hard, unbreakable, or impenetrable substance. [1/3 definitions]
airproof to make impenetrable by air. [1/2 definitions]
bulletproof to make impenetrable by bullets. [1/2 definitions]
proof resistant to penetration or damage; impenetrable; impervious. [1/13 definitions]
-tight impenetrable by.
wall something that resembles or has a function similar to a wall in that it separates, encloses, or is impenetrable. [1/8 definitions]