IPA: /ˈkaɪndliər/
KK: /ˈkaɪndli/
More gentle or considerate than someone or something else.
She spoke to the children in a kindlier tone than before.
Kindlier → It is formed from "kind" (from Old English *cynd*, meaning natural or innate) and the suffix "-lier" (a comparative suffix indicating more of a quality). The word "kindlier" means more kind or having a greater disposition to be kind.
Think of 'kind' as being natural or innate, and the '-lier' shows that it is more so. This helps you remember that 'kindlier' means more kind.