“Ought not to” in Japanese
Short answer
Ought not to in Japanese is “いけん” (iken). Full meaning: bad, wrong, naughty; must not (do, be), should not, ought not to; useless, no good, bad.
Other ways to say “Ought not to” in Japanese
行けない
ikenai bad, wrong, naughty; must not (do, be), should not, ought not to; useless, no good, bad
惟謙
iken bad, wrong, naughty; must not (do, be), should not, ought not to; useless, no good, bad
惟儼
igen bad, wrong, naughty; must not (do, be), should not, ought not to; useless, no good, bad
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