“Doing nothing but” in Japanese
Short answer
Doing nothing but in Japanese is “一途” (itto). Full meaning: way, course, the only way; wholehearted, earnest, determined, intent, single-minded, straightforward, devoted to, doing nothing but.
Other ways to say “Doing nothing but” in Japanese
一ず
ichizu way, course, the only way; wholehearted, earnest, determined, intent, single-minded, straightforward, devoted to, doing nothing but
いちず
ichizu way, course, the only way; wholehearted, earnest, determined, intent, single-minded, straightforward, devoted to, doing nothing but
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