/nän-li-nē-ər/
adj. [scientific computation]
1. Behaving in an erratic and unpredictable fashion. When used to describe the behavior of a machine or program, it suggests that said machine or program is being forced to run far outside of design specifications. This behavior may be induced by unreasonable inputs, or may be triggered when a more mundane bug sends the computation far off from its expected course.
2. When describing the behavior of a person, suggests a tantrum or a flame.