dictatorial
Bossy and controlling, not letting others disagree or decide.
Dictatorial describes behavior that's bossy, domineering, and allows no disagreement or input from others. Someone acting in a dictatorial way makes all the decisions themselves and expects everyone else to obey without question.
The word comes from dictator, a ruler who has absolute power and doesn't have to listen to anyone. When a group leader acts dictatorial, they refuse to hear other people's ideas and insist everything be done their way. A dictatorial teacher might never let students ask questions or suggest different approaches. A dictatorial team captain might refuse to consider anyone else's strategies.
You can recognize dictatorial behavior when someone treats their preferences like unbreakable laws. If your friend insists you play only the games she chooses, never compromises, and gets angry when you suggest alternatives, she's being dictatorial. The word carries a negative tone because most people don't enjoy being ordered around or having their thoughts dismissed.
Leaders can be firm and decisive without being dictatorial. The difference is whether they listen, explain their reasoning, and treat others with respect. A dictatorial person does none of these things. They simply command and expect obedience.