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Use "untranslatable" in a sentence
"The Kalakistan Fragment, supposedly untranslatable, is thought to detail the life of Gung the Magnificent who nearly conquered the world in 1932 B.C. using “supernatural powers derived from a fabulous melon-size jewel.”"
"“Kayf” is a word untranslatable in our mother-tongue!"
"Besides, many authors consider a word untranslatable when there isn't an exact one-word equivalent."