immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"; incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence"
Frequently asked questions for impregnable:
How many solutions are there for the crossword clue "IMPREGNABLE"?
There are 74 solutions. The longest is INEXTINGUISHABLE with 16 letters, and the shortest is FIRM with 4 letters.
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