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impregnable
adjective
incapable of being overcome, challenged or refuted
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adjective
incapable of being overcome, challenged or refuted
“an impregnable argument”
adjective
capable of conceiving
adjective
immune to attack; incapable of being tampered with
“an impregnable fortress”
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Example Sentences
an impregnable argument
impregnable self-confidence
an impregnable fortress
fortifications that made the frontier inviolable
a secure telephone connection
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