bul-, boul-

(Greek: will)

1. The inability to fix one’s attention; difficulty experienced in thinking; mind weariness.
2. Weak and uncertain willpower.
paraboulia, parabulia (s) (noun); paraboulias: parabulias (pl)
Perversion or volition of will in which one impulse or urge is checked and replaced by another: Parabulia is frequently found in schizophrenics who intend to do a certain thing, but suddenly stop and do something quite the opposite or totally different and unrelated.