adj: immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
adj: impossible to assail
adj: without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
Length: 12 letters
Scrabble value: 14
Words with Friends value: 19
Literati value: 13
TWL (USA): Found
SOWPODS (UK): Found
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