ideologue

/ˈaɪdiəˌlɔɡ/
noun
  1. A person who strongly supports a particular set of beliefs or ideas, often in an extreme or uncompromising way.
    • The political ideologue refused to consider any compromise on the issue.
    • She was known as a passionate ideologue who never wavered from her principles.
    • Many voters are tired of ideologues and want leaders who can work across party lines.
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