|1.||ill-behaved - [numerical analysis] Said of an algorithm or computational method that tends to blow up because of accumulated roundoff error or poor convergence properties.|
|2.||ill-behaved - Software that bypasses the defined operating system
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/mess-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. Opposite: well-behaved, compare PC-ism.