IPA: /dɪˈmɛntɪdnəs/
KK: /dɪˈmɛntɪdnəs/
A state of being mentally ill or showing severe mental decline, often characterized by confusion and irrational behavior.
The patient's dementedness made it difficult for him to recognize his family members.
Dementedness → It is formed from "de-" (meaning down or away) and "ment" (from Latin "mens", meaning mind) and the suffix "-edness" (indicating a state or condition). The word describes a state of being away from a normal state of mind, or mental derangement.
Think of 'de-' meaning 'away' from the 'mind' ('mens') — this helps you remember that 'dementedness' refers to a state of being away from normal mental function.