Etymology
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unspeakable (adj.)

c. 1400, "inexpressible," from un- (1) "not" + speakable (see speak (v.)). Meaning "indescribably bad or wicked" is recorded from mid-15c. Related: Unspeakably.

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speakable (adj.)

late 15c., from speak (v.) + -able. Also see unspeakable. Old English had sprecendlic "that should be spoken."

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book-burning (n.)

"mass destruction by fire of published material deemed obscene, corrupting, etc.," 1850, from book (n.) + verbal noun from burn (v.). As an adjective, it is attested from 1726 (in John Toland, who was a victim of it).

What an irreparable destruction of History, what a deplorable extinction of arts and inventions, what an unspeakable detriment to Learning, what a dishonor upon human understanding, has the cowardly proceeding of the ignorant or rather of the interested against unarm'd monuments at all times occasion'd! And yet this Book-burning and Letter-murdring humor, tho far from being commanded by Christ, has prevail'd in Christianity from the beginning .... [John Toland, "The History of the Druids," 1726]
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