Something seditious works against a government. When countries overthrow authoritarian dictators, often the people engage in seditious protests until the dictator has to leave.

Seditious, pronounced "si-DI-shes," comes from the Latin seditionem meaning "civil disorder, dissention." A seditious act rebels against a government or authority. In some countries just saying seditious remarks against a government can land you in jail, especially if what you say is likely to get people to rise up against the government. If you plot against the current power structure in any way, you're being seditious.

Definitions of seditious
  1. adjective
    arousing to action or rebellion
    synonyms: incendiary, incitive, inflammatory, instigative, rabble-rousing
    serving or tending to provoke, excite, or stimulate; stimulating discussion or exciting controversy
  2. adjective
    in opposition to a civil authority or government
    synonyms: insurgent, subversive
    deserting your allegiance or duty to leader or cause or principle
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