NP-: /N-P/ Pref. Extremely. Used To Modify Adjectives Describing A Level Or Quality Of Difficulty

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:NP-: /N-P/ pref. Extremely. Used to modify adjectives
describing a level or quality of difficulty; the connotation is
often `more so than it should be' (NP-complete problems all seem
to be very hard, but so far no one has found a good a priori
reason that they should be.) "Coding a BitBlt implementation to
perform correctly in every case is NP-annoying." This is
generalized from the computer-science terms `NP-hard' and
`NP-complete'. NP is the set of Nondeterministic-Polynomial
algorithms, those that can be completed by a nondeterministic
Turing machine in an amount of time that is a polynomial function
of the size of the input; a solution for one NP-complete problem
would solve all the others. Note, however, that the NP- prefix is,
from a complexity theorist's point of view, the wrong part of
`NP-complete' to connote extreme difficulty; it is the completeness,
not the NP-ness, that puts any problem it describes in the
`hard' category.
-- The AI Hackers Dictionary