Antonym: well. Similar words: deadly, bad, a bad egg, deadline, headline, rapidly, friendly, hardly any. Meaning: ['bædlɪ] 
adv. 1. to a severe or serious degree 2. (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well 3. evilly or wickedly 4. in a disobedient or naughty way 5. with great intensity (`bad' is a nonstandard variant for `badly') 6. very much; strongly 7. without skill or in a displeasing manner 8. in a disadvantageous way; to someone's disadvantage 9. unfavorably or with disapproval 10. with unusual distress or resentment or regret or emotional display.
adv. 1. to a severe or serious degree 2. (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well 3. evilly or wickedly 4. in a disobedient or naughty way 5. with great intensity (`bad' is a nonstandard variant for `badly') 6. very much; strongly 7. without skill or in a displeasing manner 8. in a disadvantageous way; to someone's disadvantage 9. unfavorably or with disapproval 10. with unusual distress or resentment or regret or emotional display. 
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91 He has had a skin graft on his badly burned arm.
92 Gas officials are investigating the cause of an explosion which badly damaged a house in Hampshire.
93 She was suffering from a badly lacerated hand.
94 His face was badly scarred after the car accident.
95 His face was badly burnt by the hot sun.
96 Lay off him! Can't you see he's badly hurt?
97 He squawked he was badly treated.
98 Though badly frightened, she appeared outwardly calm.
99 The table was badly charred by a flatiron.
100 The police blundered badly by arresting the wrong man.
101 The novel was translated badly into English.
102 Low-paid workers will fare badly/well under this government.
103 Badly fitting shoes are bound to rub.
104 The whole project was badly managed.
105 He was badly cut up in the fight.
106 Some writing travels badly in translation.
107 The British are considered ill-mannered[sentencedict.com], badly dressed and unsophisticated.
108 I'm afraid she let us down badly.
109 The party is trailing badly in the opinion polls.
110 Many of the workers are very badly paid.
111 The film flopped badly at the box office.
112 The table had been badly scratched.
113 I need a pee really badly.
114 The horse was badly frightened by the sudden noise.
115 The area suffers badly from coastal erosion.
116 The talk she gave was incoherent and badly prepared.
117 Grandpa was badly injured in the war.
118 Some of the prints were badly discoloured.
119 These tyres perform badly/poorly in hot weather.
120 I knew I had handled the matter badly.
More similar words: deadly, bad, a bad egg, deadline, headline, rapidly, friendly, hardly any, allegedly, supposedly, reportedly, repeatedly, upwardly mobile.