avolition

noun

avo·​li·​tion (ˈ)ā-ˌvō-ˈli-shən, -və- 

: a lack of interest or engagement in goal-directed behavior

Many people with schizophrenia experience avolition, or apathy, feeling drained of energy and of interest in normal goals and unable to start or follow through on a course of action.

—Ronald J. Comer, Abnormal Psychology, 7th edition

avolitional

(ˈ)ā-ˌvō-ˈlish-nəl, -ˈli-shə-nᵊl, -və- 

adjective

In studies at the Maryland Psychiatric Research Center, we have found that schizophrenia patients with avolitional pathology are a minority and that the presence of that pathology helps define a separate putative disease entity within the schizophrenia syndrome …

—William T. Carpenter, The American Journal of Psychiatry