conjecturer

/kənˈdʒɛktʃərər/
noun
  1. A person who forms an opinion or guess based on incomplete information.
    • The historian was a careful conjecturer, never stating a theory as fact without evidence.
    • The old conjecturer loved to predict the weather by watching the clouds.
    • As a conjecturer, she often guessed the endings of movies before they finished.
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