I have read in several places that people use big, fancy, complicated, and little known words (such as Brobdingnagian) to give the impression that they are knowledgeable, smart, and professional. Does that work?
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6Only to another professor :) – Mike Dunlavey May 19 '11 at 21:00
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1Brobdingnagian is known well enough beyond your corner of Lilliput. – Robusto May 19 '11 at 21:05
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40Not if you use them incorrectly. – dmckee --- ex-moderator kitten May 19 '11 at 21:39
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15Subjective. It might impress one, and disgust the other. You could try a statistical investigation, but it will be hard to find a way to ask this question in a culture-independent way. – user unknown May 20 '11 at 00:10
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6Wouldn't it depend on the audience? – Skava May 20 '11 at 01:57
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26Quite so. Granting egotistically enunciating vastly verbose sentences creates a slight maxima in my narcissism, I discover it to be quite expedient in daunting unambiguous types of individuals. – Mateen Ulhaq May 20 '11 at 02:55
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4Where's the claim from? – user5341 May 20 '11 at 05:06
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1I would really like to see an actual referenced answer to this question. – Charles May 26 '11 at 20:13
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check out http://tvtropes.org/pmwiki/pmwiki.php/Main/SesquipedalianLoquaciousness for the uses in fiction – ratchet freak Jul 23 '11 at 13:13
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I did have a stab at finding some evidence for this, and failed. I found papers on the (rather complicated) relationship between accents and perceived intelligence, but nothing (of any quality) on vocabulary. – Oddthinking Jul 24 '11 at 16:32
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This is an intrinsically subjective thing. It's sad that we can't vote to close questions with bounties. – Russell Steen Jul 25 '11 at 22:02
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I don make sum chikin jerk yessum and my ma tells me I am right smarts, dont need no fansy hi fallutin words to be smarts – Hairy Jul 27 '11 at 07:52
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I'm inclined to agree that demonstrating your use of vocabulary can have the impact of making you seem smarter, but it's effects are relative to the intelligence of the person that you're talking to. If the person on the other end has a "lower" intelligence, it's very easy to come across as being condescending. I have no particular sources, this has just been my observation. – JoelHess Jul 27 '11 at 12:33
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This is something one could add to the list of [sad things people do to look smart](http://www.cracked.com/blog/the-5-saddest-things-people-do-to-look-smart/). Since intelligent people are believed to use big words, people who want to appear intelligent will overdo it on big words. – Lagerbaer Jul 27 '11 at 15:07
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1Making you sound smart to whom? If your audience is largely uneducated, then yes, using big words makes you sound smarter. If your audience is educated, the reverse is true. Smart people express themselves with simple words and short sentences. Which is why I don't believe the premise of your question. Every guide I know of tells writers to stop being so fancy, and to simplified what they write. No rational guide on writing would recommend using bigger words. – Robert David Graham Jul 27 '11 at 17:17
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3I hypothesise that one should eschew the obfuscation of polysyllabic utterances. – matt_black Feb 21 '12 at 23:55
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@ratchetfreak Allow me to express my annoyance at your callous dissemination of that particular hyperlink. At this present day it ought to be public knowledge and ingrained good manners to precede any such meta-information with a notice of caution that usage of said entity will in all probable likelihood cause significant periods of time to become irrevocably lost to the compulsive pursuit of amusing yet non-productive trivia regarding - but not limited to - the art of moving pictures that follows. *("Dammit you! Everyone knows you don't post links to TV Tropes without a warning!" ;-) )* – Oct 25 '17 at 11:56
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One of my favourite puns from ancient Greek has always been 'εὐλογέω' -- the root for words like 'eloquent' as well as 'eulogy'. 'Eu logo' literally translates to 'To speak well' but because of a peculiarity of the language it can *also* translate to 'to speak *right*'. Put another way, they believed that eloquence wasn't just using impressive words, but also about putting them together well. Words are lego bricks. The more of them you have, and the more varied your collection, the more things you can build - but if you're a lousy builder, gold bricks won't help you make a pretty structure. – Shadur Mar 22 '19 at 13:46
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1@lagerbaer Speaking bigly with the best words, you mean? – Shadur Mar 22 '19 at 13:47
3 Answers
Although this doesn't answer your question directly, I think it does a good job of answering indirectly.
Research shows a strong correlation between vocabulary and general intelligence. So does using big words make you appear smart, maybe, but having a high level of vocabulary (and being able to use it) would indicate that you actually are smarter.
The key to the sentence above is actually being able to use the words correctly. Just going out and learning a bunch of words is not going to immediately make you smarter, but having a strong grasp of the language and a wide vocabulary indicates you are smarter.
Your question has a large subjective part to it, because if I am really clever and use lots of clever words I may be smarter than someone with a low I.Q, but they may just think I'm a dick. This means that your question answered in that way can't be answered objectively.
Now on to some examples:
Analysis indicated strong correlations between the two measures, particularly between the CREVT General Vocabulary and WISC-III Verbal IQ (r = .80), WISC-III Verbal Comprehension Index (r =.83), and the Vocabulary subtest (r =.76). These results held across the grades. (Smith, Smith, Taylor, & Hobby, 2005).
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Acquisition of word meanings, or vocabulary, reflects general mental ability (psychometric g) more than than do most abilities measured in test batteries. Among diverse subtests, vocabulary is especially high on indices of genetic influences. Behavioral and Brain Sciences (2001), 24: 1109-1110 Copyright © 2001 Cambridge University Press
This page provides about 10 examples with unlinked references.
Examples include:
Shows high positive correlation between JOCRF vocabulary score and SAT-verbal. Bowker, R. (1976)
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“English vocabulary level has been shown to be strongly related to educational success. In addition, it is related to the level of occupation attained. It is highly correlated with measures of reading ability and intelligence” Bowker, R. (1981)

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1Absolutely an interesting answer and useful for anyone coming here to learn things. It doesn't _quite_ answer the question, which is about other people's reaction to using "big fancy" words, especially if these words are used intentionally to create an impression. I think people's reaction will be very different to someone who _is_ smart with a good vocabulary than to someone who made a list of ten big words and uses them where possible to _appear_ smart. – gnasher729 May 09 '14 at 10:49
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_The key to the sentence above is actually being able to use the words correctly._ [I find this quite shallow and pedantic!](https://www.youtube.com/watch?v=yetwdpsiM8Q) – forest Mar 31 '19 at 02:54
If you're in an interview with an expert, it's better to read books on subjects they want you to know. If you're not talking to a expert, they'll be baffled by unfamiliar vocabulary and unable to determine what you're talking about. In either situation, especially with a expert, mistakes in how you use advanced vocab will cost you.
I.E., it's more important to use vocabulary that excites and motivates people (read: stay positive) than to fake knowledge and experience that you don't have.
The only motivator I can think of to use big words would be to drive off competition, and only a small amount at that.

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1Ironically, I can't post all my sources because I don't have 10 reputation yet. However, I have hyperlinked 2 of my 4 sources. – Barbarrosa Jul 27 '11 at 09:37
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1See also: http://meta.skeptics.stackexchange.com/questions/367/remove-number-of-links-restriction-for-new-users – Sklivvz Jul 27 '11 at 09:39
Your question can either be answered by yes and no, distinctively separated by your definition of "professional". Would I consider my doctor using big words, professional? I don't think so. At the same time can it be convenient, if I am with peers, to be able to share thoughts using big words as abbreviations of complex concepts.
Actually it is Johann von Goethe versus Etienne Bonnot de Condillac that nicely separate the two angles.
Goethe with his "in der Beschränkung zeigt sich erst der Meister" (in limitation one recognises the master.) and Bonnot de Condillac stating that "every science requires a special language because every science has its own ideas."

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