Etymograph

English

inexpugnableness

From inexpugnable + -ness.

Formed from inexpugnable + -ness

Proto-Indo-European *pewǵ- ‘to punch, fist-fight’

…

Latin pugnō ‘fight’

Latin expūgnō ‘to take by storm’

Latin expugnābilis ‘able to be taken by storm, expugnable’

Latin inexpugnābilis ‘impregnable, inexpugnable’

English inexpugnable

Today it means

noun The quality of being inexpugnable.

Language periods are conventional ranges, not dates for this word.

Etymograph / inexpugnableness