1) Given to using long words 2) Having many syllables 3) Long and ponderous 4) Long word for a long word 5) Pretentious 1) Pretentious 2) Sesquipedalia 
tending to use long or cumbersome words
• (a.) Measuring or containing a foot and a half; as, a sesquipedalian pygmy; -- sometimes humorously applied to long words.
Sesquipedalian: A long polysyllabic word that means having many syllables or using long words, as is all too often the case with medical terms. From the Latin sesqui- meaning one and a half times + ped, pes meaning foot. In Ars Poetica, the Roman poet Horace cautioned young poets against using 'sesquipedalia verba' -- 'words a foot and a half long....
[adj] - given to the overuse of long words 2. [n] - a very long word (a foot and a half long)
sesquipedalian 1. Of words and expressions (after Horace`s sesquipedalia verba, `words a foot and a half long”). Of many syllables. 2. A word with many letters or syllables. 3. A description of a person who is overly given to using long words; especially when verbal construction utilizing less amplification might represent a more naturally effica...
adjective given to the overuse of long words; `sesquipedalian orators`; `this sesquipedalian way of saying one has no money`