The Collaborative International Dictionary of English v.0.48:
Nonperformance \Non`per*form"ance\, n. Neglect or failure to perform. [1913 Webster] nonphilosophicWordNet (r) 3.0 (2006):
nonperformance n 1: failure to act with the prudence that a reasonable person would exercise under the same circumstances [syn: negligence, carelessness, neglect, nonperformance]