IPA: //ʌnˈbʌtərd//
KK: /ʌnˈbʌtərd/
Describing something that has not been spread with butter.
I prefer my toast unbuttered so I can enjoy the taste of the bread.
Unbuttered → It is formed from "un-" (meaning not) and "buttered" (from the verb "butter", which comes from Old English "butter", meaning to spread butter on). The word "unbuttered" means not spread with butter.
Think of 'not' ('un-') having butter spread on it — that's why unbuttered means without butter.