“Cannot help but” in Japanese
Short answer
Cannot help but in Japanese is “せざる得ない” (sezaruenai). Full meaning: cannot avoid doing, cannot help but (do), is compelled to do, (feel) obliged to (do), has to do.
Other ways to say “Cannot help but” in Japanese
せざるを得ない
sezaruwoenai cannot avoid doing, cannot help but (do), is compelled to do, (feel) obliged to (do), has to do
やらざるを得ない
yarazaruwoenai cannot avoid doing, cannot help but (do), is compelled to do, (feel) obliged to (do), has to do
居られる
irareru can be, can exist, can stay; cannot help but ...
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