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inexpugnable (adj.)
[inexpugnable 词源字典]
late 15c., from Latin
inexpugnabilis
"not to be taken by assault," from
in-
"not" (see
in-
(1) +
expuglabilis
, from
expugnare
(see
expugn
).
[inexpugnable etymology, inexpugnable origin, 英语词源]
[inexpugnable 词源字典]