IPA: /ʌnˈtʃɑːrmɪŋ/
KK: /ʌnˈtʃɑrmɪŋ/
Not attractive or pleasant in appearance or manner.
The uncharming decor of the room made it feel cold and uninviting.
Uncharming → It is formed from "un-" (meaning not) and "charming" (from Old French *charmer*, meaning to delight or enchant). The word "uncharming" means not delightful or lacking charm.
Think of 'not' ('un-') being added to 'delight' or 'enchant' ('charming') — that's why uncharming means lacking charm.