“Coincidentally” in Japanese
Short answer
Coincidentally in Japanese is “偶さか” (tamasaka). Full meaning: coincidentally, by chance, unexpectedly, accidentally, randomly; rarely, unusually, seldom, once in a while.
Other ways to say “Coincidentally” in Japanese
偶然にも
guuzennimo by chance, coincidentally, as it happens
がてら
gatera on the same occasion, at the same time, coincidentally, along with, partly (to do, for)
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