形容詞 inexpugnable:

1. incapable of being overcome, challenged or refuted
   同義詞：impregnable

in.ex.pug.na.ble

adj.（形容詞）
Impossible to overcome or overthrow by force.
不能用武力征服或擊敗的
Impossible to put aside or drive away:
驅(qū)逐不了的：無法置于一旁或趕走的：
例句：
inexpugnable dislike.
驅(qū)之不去的厭惡

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin inexpugn3bilis
源自 拉丁語 inexpugn3bilis
in- [not] * see in-
in- [不] *參見 in-
expugn3bilis [capable of being overcome] from expugn3re ex- [completely] * see ex- pugn3re [to fight] * see impugn
expugn3bilis [能夠被征服] 源自 expugn3re ex- [完全地] *參見 ex- pugn3re [戰(zhàn)斗] *參見 impugn

【引伸】
in.expugnabil.ity
n.（名詞）
in.expug.nably
adv.（副詞）