Badly

wiktionary

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From Middle English badly, baddely, baddeliche, equivalent to bad +‎ -ly.

etymonline

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badly (adv.)

c. 1300, "unluckily;" late 14c., "wickedly, evilly; poorly, inadequately," from bad (adj.) + -ly (2). By 1814 as "incorrectly;" meaning "very much" is by 1849, American English.