Answer:
Dictatorial governments are unitary by definition, because they concentrate power either on a single person (the dictator) or on a few individuals, who micromanage government affairs as much a possible.
Democracy is also compatible with unitary governments, because power in unitary governments, while being more concentrated than in federal governments, can still be democratically elected. There are many examples of democratically-elected unitary governments around the world.
France is one of those examples: an unitary government ever since the French Revolution, it is currently one of the strongest democracies in the world and a highly developed country.
