“Least-worst” in Japanese
Short answer
Least-worst in Japanese is “増し” (mashi). Full meaning: better, preferable, less objectionable, least-worst; more, increase, extra.
Other ways to say “Least-worst” in Japanese
マシ
mashi better, preferable, less objectionable, least-worst; more, increase, extra
増じ
zouji better, preferable, less objectionable, least-worst; more, increase, extra
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