kindly (adj.)

c. 1200, cundelich, "natural, right, lawful," from Old English gecyndelic "natural, innate; in accordance with the laws or processes of nature, suitable, lawful" (of birth, etc.); see kind (adj.) + -ly (1). From late 14c. as "pleasant, agreeable;" from 1560s as "full of loving courtesy." Related: Kindliness. The Old English word also meant "pertaining to generation," hence cyndlim "womb," in plural "genitalia," literally "kind-limb."

kindly (adv.)

c. 1200, cundeliche, "natively, congenitally; according to nature," from Old English gecyndelice "naturally;" see kind (adj.) -ly (2). From mid-13c. as "pleasantly, gladly, with kind feelings, in a kind manner." Also in Middle English, "by birth or descent; in the approved manner, properly" (late 14c.).

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Definitions of kindly from WordNet
kindly (adj.)
showing or motivated by sympathy and understanding and generosity;
kindly criticism
a kindly act
Synonyms: charitable / benevolent / sympathetic / good-hearted / openhearted / large-hearted
kindly (adj.)
pleasant and agreeable;
kindly breeze
a kindly climate
kindly (adv.)
in a kind manner or out of kindness;
she kindly overlooked the mistake
He spoke kindly to the boy