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LingakuLingaku[verb (dictionary form)] + な
The prohibitive な is a sentence-ending particle attached directly to the dictionary form of a verb to express a strong negative command – "Don't do ~!" It is one of the most direct ways to prohibit an action in Japanese.
Verb[dictionary form] + な
The prohibitive な is blunt and forceful. It is commonly heard in casual or rough speech – for example, between close friends, in arguments, from a parent scolding a child, or in dramatic/urgent situations. It carries a much stronger tone than the polite 〜～ないでください.
Because of its directness, using it toward strangers or superiors would be considered rude. In everyday polite speech, 〜～ないでください is the appropriate alternative.
Warnings and urgent commands: Signs, shouts in emergencies, or rules may use this form.
Emotional outbursts: When someone is upset or frustrated.
Casual speech among close people:
Adding よ after な (as in ゆう言うなよ) softens the tone slightly, making it sound more like a plea or casual warning rather than a harsh command.