Wordnet 3.0
NOUN (1)
1. 
 a tendency to be negligent and uncaring; 
- Example: "he inherited his delinquency from his father"- Example: "his derelictions were not really intended as crimes"- Example: "his adolescent protest consisted of willful neglect of all his responsibilities"[syn: delinquency, dereliction, willful neglect]
WordNet (r) 3.0 (2006):
willful neglect
    n 1: a tendency to be negligent and uncaring; "he inherited his
         delinquency from his father"; "his derelictions were not
         really intended as crimes"; "his adolescent protest
         consisted of willful neglect of all his responsibilities"
         [syn: delinquency, dereliction, willful neglect]