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unreasonable (adj.)
[unreasonable 词源字典]
mid-14c., "irrational, illogical," from
un-
(1) "not" +
reasonable
. From late 14c. as "excessive, going beyond what is sensible or realistic." Related:
Unreasonably
;
unreasonableness
.
[unreasonable etymology, unreasonable origin, 英语词源]