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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121 They blundered badly when they gave him the job.
122 He wasn't badly hurt-that's something to be thankful for.
123 The election went badly for the Conservatives.
124 She had a badly deformed hand.
125 His ankle is bruised and quite badly swollen.
126 The shipping trade was badly depressed.
127 I thought he behaved very badly.
128 They were badly hurt in the accident.
129 The war has badly damaged the country's infrastructure.
130 The witness tripped up rather badly under close cross-examination.
131 It shames me that I treated her so badly.
132 She's always bleating about how badly she's been treated.
133 He slipped and fell, badly bruising an elbow.
134 Many towns were badly blitzed during the war.
135 I had banged my head badly.
136 Hague was lagging badly in the polls.
137 The ship was listing badly but still kept afloat.
138 The walls had been painted very badly.
139 The damaged vessel was listing badly.
140 They are badly in need of help.
141 The whole report is badly written. Moreover[sentencedict.com], it's inaccurate.
142 Their cat was badly bitten by a dog.
143 He was unshaven, and badly needed a haircut.
144 He was badly in need of a shave.
145 The government slipped up badly over the scandal.
146 She felt she needed an ally so badly.
147 Oil prices have slumped quite badly in recent months.
148 I did badly in my exams.
149 I slept really badly last night.
150 She was badly mauled by a lion.
More similar words: deadly, bad, a bad egg, deadline, headline, rapidly, friendly, hardly any, allegedly, supposedly, reportedly, repeatedly, upwardly mobile.