Use the adjective sesquipedalian to describe a word that's very long and multisyllabic. For example the word sesquipedalian is in fact sesquipedalian.

Sesquipedalian can also be used to describe someone or something that overuses big words, like a philosophy professor or a chemistry textbook. If someone gives a sesquipedalian speech, people often assume it was smart, even if they don’t really know what it was about because they can’t understand the words. Each of those long words is referred to as a sesquipedalia. Antidisestablishmentarianism is a sesquipedalia: in fact it’s the longest non-coined and nontechnical word in the English language.

Definitions of sesquipedalian
  1. noun
    a very long word (a foot and a half long)
    synonyms: sesquipedalia
    see moresee less
    type of:
    polysyllabic word, polysyllable
    a word of more than three syllables
  2. adjective
    given to the overuse of long words
    sesquipedalian orators”
    “this sesquipedalian way of saying one has no money”
    making claim to or creating an appearance of (often undeserved) importance or distinction
  3. adjective
    (of words) long and ponderous; having many syllables
    sesquipedalian technical terms”
    synonyms: polysyllabic
    primarily spatial sense; of relatively great or greater than average spatial extension or extension as specified
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