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ruthless (adj.)
[ruthless 词源字典]
early 14c., from
reuthe
"pity, compassion" (see
ruth
) +
-less
.
Ruthful
(early 13c.) has fallen from use since late 17c. except as a deliberate archaism. Related:
Ruthlessly
;
ruthlessness
.
[ruthless etymology, ruthless origin, 英语词源]