Jisho

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Expressions (phrases, clauses, etc.)
1. useless; no good; hopelessUsually written using kana alone, Kansai dialect, commonly used with i-adjective inflections, e.g. あかんかった, あかんくない
Expressions (phrases, clauses, etc.)
2. cannot; must not; not allowedUsually written using kana alone, Kansai dialect
Other forms
アカン
Notes
明かん: Rarely-used kanji form.

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