Etymology From Middle English badly, baddely, baddeliche, equivalent to bad + -ly.
1
In a bad manner.
Things are going badly for her: she did badly in her exams owing to a badly designed studying schedule.
Don't think badly of me, give me the benefit of the doubt.
2 more examples
I feel badly about the accident because it was entirely our fault.
You can eat badly and feel crapola or eat healthily and feel great. The choice is yours...2005, Cathy Hopkins, The Mates, Dates Guide to Life, Love, and Looking Luscious:
2
Very much; to a great degree.
I want it so badly.
Look at these split ends! You badly need a haircut!
3 more examples
Everything went badly wrong.
The task was made trebly difficult, however, by the badly run-down condition in which the railways of Britain had been unavoidably left at the end of the war in 1945, […].1958 January 23, 'Borderer', “Ten Years of British Railways”, in Railway Magazine, page 12:
In late 1970, Labour assumed the shadow posts, having lost badly (and unforeseenly) in the summer General Election.2008, Darl Larsen, Monty Python's Flying Circus, page 276: