What constitutes a double negative?


Is "not unpleasant" a double negative, and hence bad grammar? See the first answer (by Ham and Bacon) to this question, for the basis of this question.


Are all "not un..." forms incorrect? They are very widely used, much more so than the blatant "not not" or "didn't not", etc.



Answer



There are two distinct meanings to the phrase "double negative":



  • one (which most people understand by it) is a particular prescriptive rule that applies specifically to Standard English, but not many dialects. As mentioned elsewhere it only refers to using 'no' or 'no-' when 'any or 'any-' is supposed to be used. E.g.:



I don't want nothing



is OK in nonstandard English but in Standard English it is:



I don't want anything



This is the only thing referred to when people say "don't use double negatives".



  • the other is 'more than one logically intended negative'. This is perfectly grammatical in -all- dialects but, because of the semantic depth/cognitive processing limitations, is often hard to understand. E.g.:



I can't not be pleased at your compliment.



means the negation of the negation of the ability to be pleased, from which it follows literally that it is possible to be pleased.


Whether explicit implicit negation words are used, the logical content has a depth of at least two negations. These can sound wrong because of the difficulty in processing.



I don't deny the impossibility of regret from no lack of silence.



It's perfectly grammatical, and it has a specific calculable meaning, but I'm just not sure yet exactly what that is.


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