kindly (adj.) Look up kindly at
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.) Look up kindly at
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.).