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unreserved (adj.)
[unreserved 词源字典]
1530s, "not restricted or withheld," from
un-
(1) "not" + past participle of
reserve
(v.). From 1713 as "open, frank." Related:
Unreservedly
.
[unreserved etymology, unreserved origin, 英语词源]
[unreserved 词源字典]