You, as an adult, after your naturalisation, have not done everything possible to renounce your other citizenship with your own authorities.
You committed fraud during your naturalisation process or option procedure. For example, fraud that involves your identity. You commit fraud if you make a false declaration, deceive or conceal important facts. And you became a Dutch citizen as a result of it. You would not have received the Dutch nationality if you had not committed fraud.
You are convicted of a crime against the safety of the Kingdom. For example, a war crime or a crime with a terrorist motive. These are actions that seriously harm the interests of the Kingdom.
You voluntarily serve in the armed forces of a state. And these armed forces fight against the Netherlands or one of the Dutch allies.