A play on the common term "user-friendly", a user-hostile design is one that is, deliberately or accidentally, difficult or cumbersome for the intended user.

Often used derisively to describe the competition.
We intend to improve upon the user-hostile design of your existing sales tool.

Some say that the user-hostile design of the original QWERTY keyboard was an intentional effort to slow typists down so as not to allow them to jam the mechanical parts.
by jfkelley June 16, 2009
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The opposite of "user-friendly" design, it defines the likely product of design work that does not include continual involvement of users in the requirements and design process.
The user-hostile design of the user interface for this product resulted from a design attempt by the developers with no style guide and no user-centered design methods.
by jfkelley January 21, 2012
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