adj: immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
adj: capable of conceiving
adj: incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence"
Length: 11 letters
Scrabble value: 18
Words with Friends value: 21
Literati value: 13
TWL (USA): Found
SOWPODS (UK): Found
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