vegetablization
/ˌvɛdʒ(ɪ)təb(ə)lʌɪˈzeɪʃn/noun
The action or fact of rendering a person docile or passive by impairing his or her intellectual function. Compare vegetablize. Now rare.
Origin
1940s (in an earlier sense). In sense 1 from vegetablize + -ation.