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@MatthewDave is quite right in saying that a sophisticated person's language would be distinguished by lack of 'lower-class' colloquialisms. Add to that impeccable grammar, and a rich vocabulary. ...
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Source: https://writers.stackexchange.com/a/38747 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/38747 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
@MatthewDave is quite right in saying that a sophisticated person's language would be distinguished by lack of 'lower-class' colloquialisms. Add to that impeccable grammar, and a rich vocabulary. By rich vocabulary I do not mean random use of fancy words. Instead, I mean words with a narrower meaning, that fit the given situation with greater precision. For example, above, I could have said "good grammar" or "perfect grammar". "Impeccable" has a narrower meaning than either, so it's less likely for a person to have seen it. Using the word with ease implies one is sufficiently well-read to have the word not only in one's passive vocabulary (understanding what it means), but also in one's active vocabulary (using it correctly). And being well-read remains to this day a mark of upper classes. It was even more so in the past. Inserting archaic words that are no longer in use is _not_ a mark of "posh" English. Instead, it is the shorthand Holywood use to signify something is happening in the past, or that a text being read is old (a trope known as [Ye Olde Butcherede Englishe](https://tvtropes.org/pmwiki/pmwiki.php/Main/YeOldeButcheredeEnglishe)). Moreover, Holywood usually use older words incorrectly, disregarding period grammar and often muddling what the words actually meant. (For instance, 'thou' is often used in movies as a politer form of 'you'. In truth, the opposite is the case. 'Thou' was second-person singular, while 'you' was second-person plural. Etiquette dictated that social superiors, and then equals too, be addressed in the plural, until finally the plural supplanted the singular entirely. A similar form of address still exists in French, Spanish and Russian, among other languages. For more information, see [T-V distinction](https://en.wikipedia.org/wiki/T%E2%80%93V_distinction).) Another mark of good education, and therefore of higher class, is maintaining the same register throughout one's conversation (or changing registers _deliberately_ for a humorous effect). A register is the variety of language used for a particular purpose or in a particular social setting. For example, language might be more formal, or it might be less formal. In your example, however, "quite generous" and "nice bonus" belong to different registers.