alogia
/ˌeɪˈləʊdʒɪə/ /əˈləʊdʒɪə/Medicine
noun
Inability, or loss of the ability, to speak, especially as a result of defective intelligence or cerebral disease; (in later use) specifically reduction in the amount of spontaneous speech or in the content of speech (as a symptom of schizophrenia).
Origin
Mid 19th century; earliest use found in The British Medical Journal. From French alogie, with remodelling of the ending after formations in -ia.