I've researched and I found out that "Pleonasm" is not what I'm referring to. So it's not that.

For example: The term prognosticate -"To prognosticate weather conditions is not a simple matter."

We can simply just use predict or foretell.

All in all, I am asking is there a term that describes such useless terms or ways of talking that we don't ordinarily use or shouldn't use to seem ostentatious or pretentious on a daily basis?

  • 2
    They're called "synonyms". Eventually some synonyms may fall out of use, in which case they're literally "useless". But just because a word is seldom used does not make it "useless". As others note, some people may make use of seldom-used words for several reasons. But one reason not mentioned is that there are very few exact synonyms -- each word has a separate personality. – Hot Licks Jan 19 '16 at 19:46

There are several words that might fit.

Archaic - words or idioms no longer in general use

Outmoded, Outdated, Obsolete - as above

Ostentatious - something used mostly to show off (knowledge, wealth, etc)

Pendantic - ostentatious words, ideas. More interested in being academically accurate than in communicating effectively

  • These answer the question the best, I think. Archaic and Outdated are the most common ones I've heard. – BleepBloopOverflow Jan 19 '16 at 19:50

In writing, purple prose fits that description.

In literary criticism, purple prose is prose text that is so extravagant, ornate, or flowery as to break the flow and draw excessive attention to itself. Purple prose is characterized by the extensive use of adjectives, adverbs, zombie nouns, and metaphors. - Wikipedia

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