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sesquipedalianism - definition and synonyms

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noun very formal
  1. From our crowdsourced Open Dictionary
    the use of verbose or high flown language

    The professor loved to indulge in a bit of sesquipedalianism to impress his students.

    Submitted by Nerrad65 from United Kingdom on 17/12/2016
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gaslight

to manipulate someone psychologically so that they begin to question their own perceptions and memories

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Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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