sesquipedalian words

See: bombast
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Many people still think that using sesquipedalian words (literally, words that are a foot-and-a-half long) will impress their listeners.
In fact, we suggest using spell checkers with caution and urge extra suspicion of grammar checkers, which can offer weak and sometimes inaccurate alternatives, especially when faced with long sentences like this one, full of sesquipedalian words.
Anil points out an interesting truth that shows the exaggerative qualities of people specializing in the field of logology: "I doubt that we will ever find any truly sesquipedalian words unless we count the poly-hyphenated amino acid sequences of proteins or the acronymic DNA base sequences of genes.