Adjectives

(s)charitable, benevolent, kindly, sympathetic, good-hearted, openhearted, large-heartedshowing or motivated by sympathy and understanding and generosity“was charitable in his opinions of others”, “kindly criticism”, “a kindly act”, “sympathetic words”, “a large-hearted mentor”
(s)kindlypleasant and agreeable“a kindly climate”, “kindly breeze”

Adverbs

(r)kindlyin a kind manner or out of kindness“He spoke kindly to the boy”, “she kindly overlooked the mistake”