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ill-behaved

ill-behaved: adj. 1. [numerical analysis] Said of an algorithm or
   computational method that tends to blow up because of accumulated
   roundoff error or poor convergence properties.  2. Software that
   bypasses the defined OS interfaces to do things (like screen,
   keyboard, and disk I/O) itself, often in a way that depends on the
   hardware of the machine it is running on or which is nonportable or
   incompatible with other pieces of software.  In the IBM PC/MS-DOS
   world, there is a folk theorem (nearly true) to the effect that
   (owing to gross inadequacies and performance penalties in the OS
   interface) all interesting applications are ill-behaved.  See also
   bare metal. Oppose well-behaved, compare PC-ism.  See
   mess-dos.