IPA: /ʌnˈkærɪzmætɪk/
KK: /ʌnˈkærɪzmætɪk/
Someone who does not have charm or appeal; they may not attract or inspire others easily.
Despite his intelligence, he was often seen as uncharismatic in social situations.
Uncharismatic → It is formed from "un-" (meaning not) and "charismatic" (from Greek "charisma", meaning favor or gift). The word "uncharismatic" means lacking charm or appeal, indicating a person who does not possess the qualities that attract or inspire others.
Think of 'not' ('un-') having a 'gift' or 'favor' ('charisma') — that's why uncharismatic means lacking charm.