say it: di-MEN-tid
demented is an adjective meaning "affected with madness or insanity". It is pronounced /dɪˈmɛntɪd/ — di-MEN-tid. It carries one recorded sense.
Definitions, synonyms and semantic relations for demented come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.