<unk>  is a psychological state characterized by general lack of desire, motivation, and persistence. Commonly seen in patients with schizophrenia, those suffering from<unk>  will not start or complete any major tasks.  This differs from anhedonia, where patients generally find task completion pleasureless.
It is the reduction, difficulty, or inability to initiate and/or persist in goal-directed behavior; it is quite often mistaken for apparent disinterest.<unk>  refers to the lack of initiative, or loss in drive and motivation to pursue realistic goals.<unk>  is one of the four (affective flattening, alogia, anhedronia) main 'negative' symptoms of Schizophrenia. 
DSM IV criteria for schizophrenia or schizo-affective disorder:
Characteristic symptoms are two (or more) of the following, each present for a significant portion
of time during a 1-month period: delusions, hallucinations, disorganized speech (e.g., frequent derailment or incoherence), grossly disorganized or catatonic behavior, negative symptoms, i.e., affective flattening, alogia, or<unk> .
Avolition
Insemination
Attachment 
Exaptation
Assay
Accommodation 
Polishing 
Relay For Life