The word "arigato" (有難う), or "thank you" in Japanese, finds its roots in the word arigatashi (有り難し), an archaic adjective describing rarity.
Arigatashi was used in the Japanese language at least as early as 1000 years ago, as it is documented in both the Tale of Genji and Sei Shonagon's pillow book. Originally, the adjective indicated that an object was difficult to have or come by, or...
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