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unspeakable (adj.)
[unspeakable 词源字典]
c. 1400, "inexpressible," from
un-
(1) "not" +
speakable
(see
speak
(v.)). Meaning "indescribably bad or wicked" is recorded from mid-15c. Related:
Unspeakably
.
[unspeakable etymology, unspeakable origin, 英语词源]