The loss of will-power, as a mental disorder or of making decisions: Some of the symptoms of aboulia are a reduction in spontaneous speech, movement, thought, emotional reaction, and initiative.

A disorder marked by the partial or total inability to make decisions: Byron was told that he had abulia, also known as aboulia. In other words, he had neither the willpower nor any "wish power" and so he wasn't able to decide what to do and not even capable of doing anything even if he wanted to.