IPA: //ʌnˈlʌvliɪst//
KK: /ʌnˈlʌvliɪst/
The least attractive or pleasant in appearance or character.
Despite its unloveliest features, the building has a unique charm.
Comparative: more unlovely
Superlative: unloveliest
Unloveliest → It is formed from "un-" (meaning not) and "lovely" (from Old English "luflic", meaning full of love or pleasing) and the superlative suffix "-est" (meaning most). The word "unloveliest" means the most lacking in beauty or love, or the least pleasing.
Think of 'not' ('un-') combined with 'full of love' ('lovely') — so 'unloveliest' means the most lacking in love or beauty.