'uncharismatic' originates from English: it is formed by the prefix 'un-' (from Old English 'un-', meaning 'not') added to 'charismatic', which ultimately derives from Greek 'charisma' via ecclesiastical or New Testament Latin/modern European usage.

'charisma' comes from Greek 'χάρισμα' (charisma, 'gift, favor') from 'χάρις' (charis, 'grace, favor'). 'Charismatic' developed in modern English from 'charisma' + suffix '-ic'/'-atic'; 'un-' was later prefixed to create 'uncharismatic'.

Originally 'charisma' meant 'a gift or favour' (especially a spiritual gift); over time it shifted to mean personal charm or compelling attractiveness. 'Uncharismatic' therefore developed to mean 'lacking that personal appeal'.