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Elizabeth Swann: Captain Barbossa, I am here to negotiate the cessation of hostilities against Port Royal.
Captain Barbossa: There are a lot of long words in there, Miss; we’re naught but humble pirates. What is it that you want?
Elizabeth: I want you to leave and never come back.
Barbossa: I’m disinclined to acquiesce to your request.
Elizabeth:[stares at him in shock]
Barbossa: Means “no.”
— Pirates of the Caribbean: The Curse of the Black Pearl

Sesquipedalian: A long word, or characterized by the use of long words. From the Latin roots meaning “a foot-and-a-half long.”
Loquaciousness: That would be garrulousness, verboseness, effusiveness. How about “chattiness”?
. Also known as “gross verbosity”. Related to this is the use of inkhorn terms, loanwords from a foreign origin that are pretentious to an average speaker.

In brief: “smart” characters using long words when short ones would be better, especially when they are also motor mouths.

