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poorly behaved; lacking good manners
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Examples from the Web for ill-behaved
Historical Examples
  • Who was she to have dared speak to them of the evil of their ways, and the bad influence of an ill-behaved family!

    Weighed and Wanting George MacDonald
  • He would still have been giving instruction in reading and writing to ill-behaved youngsters.

    Casanova's Homecoming Arthur Schnitzler
  • The ill-behaved charity-boys emulously trying who shall make the hind-legs of his chair squeak the loudest on the stone floor.

    Nancy Rhoda Broughton
  • The thoughts will come tumbling out like ill-behaved children just let out of school.

    Lover or Friend Rosa Nouchette Carey
  • But now you know him, and you know, too, how ill-behaved he is!

    A Christmas Greeting Hans Christian Andersen
  • I never saw such an ill-behaved brute, yet he intended to be most agreeable.

  • I had to go out and help move them; and I must say they were as ill-behaved a set as I ever had anything to do with.

  • Felicia became noisy, turbulent, ill-behaved, but without being touched by all that passed over her little soul so near to earth.

    The Nabob Alphonse Daudet
  • What a pity that such an aunt must know that she was an ill-behaved child, a misfortune to her lineage!

    Countess Kate Charlotte M. Yonge
  • Leaving science to unravel this problem, it may be said of the dingo that he is a good-looking but an ill-behaved animal.

    Australian Pictures Howard Willoughby
ill-behaved in Technology

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 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.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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