neg·a·tiv·ism 
(nĕgə-tĭ-vĭz′əm)
(nĕgə-tĭ-vĭz′əm)n.
1. The practice or habit of being skeptical, critical, or pessimistic, especially toward the views or suggestions of others.
2. Behavior characterized by persistent refusal, without apparent or logical reasons, to act on or carry out suggestions, orders, or instructions of others.
nega·tiv·ist n.
neg′a·tiv·istic adj.