indoctrinator

/ɪnˈdɑktrəˌneɪtər/
noun
  1. A person who teaches someone to accept a set of beliefs uncritically, often in a forceful or one-sided way.
    • The cult leader was an indoctrinator who controlled every thought of his followers.
    • History books sometimes portray political leaders as indoctrinators of propaganda.
    • She saw the strict teacher as an indoctrinator rather than an educator.
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