impregnable
/ɪmprˈɛgnʌbʌl/
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Definitions
Adjective Satellite
immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
Adjective Satellite
capable of conceiving
Adjective Satellite
incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence"