sesquipedalian

adj

(of a word or words) Long; polysyllabic. / Pertaining to or given to the use of overly long words.

He used a sesquipedalian vocabulary to impress his professors.

意味（1）

(of a word or words) Long; polysyllabic.

The most common use of "antidisestablishmentarianism" is as an example of a sesquipedalian word.

意味（2）

Pertaining to or given to the use of overly long words.

Our dinner guest was so sesquipedalian that no one could understand what he said.