IPA: //ʌnˈkaɪndli//
KK: /ʌnˈkaɪndli/
This word describes someone or something that is less kind or more cruel than another. It is used to compare the level of unkindness between two subjects.
His comments were unkindlier than I expected, making the situation even worse.
Unkindlier → It is formed from "un-" (meaning not) and "kindly" (from Old English "cynd", meaning natural or of a kind nature) with the comparative suffix "-er" (indicating a higher degree). The word "unkindlier" means in a manner that is not kind or more unkind than something else.
Think of 'not' ('un-') being added to 'kind' ('cynd') to describe a way of behaving that is less kind or more harsh.