Prolix
Verbosity, or verboseness, is speech or writing that uses more words than necessary. The opposite of verbosity is succinctness.
Some teachers, including the author of The Elements of Style, warn against verbosity. Similarly Mark Twain and Ernest Hemingway, among others, famously avoided it.
Synonyms of "verbosity" include wordiness, verbiage, loquacity, garrulousness, logorrhea, prolixity, grandiloquence, expatiation, sesquipedalianism, and overwriting.
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