adverb, worse, worst.
in a defective, incorrect, or undesirable way: The car runs badly.
in an unsatisfactory, inadequate, or unskilled manner: a vague, badly written letter; He paints badly.
unfavorably: His neighbors spoke badly of him. The weather turned out badly for the cruise.
in a wicked, evil, or morally or legally wrong way.
in a disobedient, naughty, or ethically or socially wrong way: He treats his parents badly.
very much; to a great extent or degree: a house badly in need of repair; to want something badly.
severely; direly: to be injured badly.
with great distress, resentment, regret, or emotional display: She took the news of her mother's death badly.
in ill health; sick: He felt badly.
sorry; regretful: I feel badly about your reaction to my remark.
dejected; downcast.
badly off. bad ( def 47 ).

1350–1400; Middle English baddeli. See bad1, -ly

bad, badly (see usage note at bad)(see usage note at the current entry).

In the sense “very much,” badly is fully standard: He needs help badly. See also bad. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
badly (ˈbædlɪ)
adv , worse, worst
1.  poorly; defectively; inadequately: the chair is badly made
2.  unfavourably; unsuccessfully; unfortunately: our scheme worked out badly
3.  severely; gravely: he was badly hurt
4.  incorrectly or inaccurately: to speak German badly
5.  improperly; naughtily; wickedly: to behave badly
6.  without humanity; cruelly: to treat someone badly
7.  very much (esp in the phrases need badly, badly in need of, want badly)
8.  regretfully: he felt badly about it
9.  badly off poor; impoverished
10.  dialect (Northern English) (postpositive) ill; poorly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It is a certain effort to read a story, however touching, that is disconnected
  and badly related.
It occurs in badly nourished people, or in those who have become emaciated from
  any cause.
They were in many ways well treated, but they were never treated as equals, and
  they were sometimes treated badly.
Any corporation which seeks its profit in such fashion is acting badly.
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