impregnable
adjective /ɪmˈpreɡnəbl/
/ɪmˈpreɡnəbl/
- an impregnable building is so strongly built that it cannot be entered by force
- an impregnable fortress
- strong and impossible to defeat or change synonym invincible
- The team built up an impregnable 5–1 lead.
- the seemingly impregnable Nazi regime
Word Originlate Middle English: from Old French imprenable, from in- ‘not’ + prendre ‘take’ (from Latin prehendere). The current spelling arose in the 16th cent., perhaps influenced by Old French variants.