"Secretive regime" is a commonly used term in the political sphere to describe a government that operates in secrecy and is resistant to change or opposition. Synonyms for this term could include "authoritarian regime," "totalitarian government," or "closed society." These terms all describe a government that restricts individual freedoms and suppresses dissenting opinions, often through the use of censorship, propaganda, and violence. Other possible synonyms for "secretive regime" could include "dictatorial state," "repressive regime," or "autocratic government." These terms all convey a sense of oppressive control over a population, with limited access to information, limited civil liberties, and limited opportunities for political or personal expression.