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unaccountable (adj.)
[unaccountable 词源字典]
1640s, "inexplicable," from
un-
(1) "not" +
accountable
. Meaning "not liable to be called to account" is recorded from 1640s. Related:
Unaccountably
;
unaccountability
;
unaccountableness
.
[unaccountable etymology, unaccountable origin, 英语词源]