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misfeature: /mis-fee'chr/ or /mis'fee`chr/ n. A feature that
   eventually causes lossage, possibly because it is not adequate for
   a new situation that has evolved.  Since it results from a
   deliberate and properly implemented feature, a misfeature is not a
   bug.  Nor is it a simple unforeseen side effect; the term implies
   that the feature in question was carefully planned, but its
   long-term consequences were not accurately or adequately predicted
   (which is quite different from not having thought ahead at all).  A
   misfeature can be a particularly stubborn problem to resolve,
   because fixing it usually involves a substantial philosophical
   change to the structure of the system involved.

Many misfeatures (especially in user-interface design) arise because the designers/implementors mistake their personal tastes for laws of nature. Often a former feature becomes a misfeature because trade-offs were made whose parameters subsequently change (possibly only in the judgment of the implementors). "Well, yeah, it is kind of a misfeature that file names are limited to six characters, but the original implementors wanted to save directory space and we're stuck with it for now."