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gadfly noun

  /ˈɡædflaɪ/ , /ˈɡædˌflaɪ/
  • (specifically) A person who upsets the status quo by posing novel or upsetting questions, or attempts to stimulate innovation by being an irritant.
  • A person or thing that irritates or instigates.
 Querulant, Quälgeist, Störenfried
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