sesquipedalian
/ˌsɛskwɪpɪˈdeɪlɪən/
noun
Meaning
A long word.
A person who uses long words.
adjective
Meaning
(of a word or words) Long; polysyllabic.
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."
Synonyms