inexpugnable
/ˌɪnɪkˈspʌɡnəb(ə)l
/ /ˌɪnɛkˈspʌɡnəb(ə)l/adjective archaic
Impregnable.It evinces an overdiminished but nevertheless inexpugnable desire for moral as well as ethical rectitude....
- I mean the inexpugnable belief that every detailed occurrence can be correlated with its antecedents in a perfectly definite manner exemplifying general principles.
- The city is fortified with 150 very strong towers, covered over with ceilings from the upper stories of the buildings in its streets like a crypt, and in a measure inexpugnable.
Origin
Late Middle English: via Old French from Latin inexpugnabilis, from in- 'not' + expugnabilis 'able to be taken by assault'.