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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1 He was spitting blood from a badly cut lip.
2 Romania badly needs aid to modernise its outmoded industries.
3 The warehouse has been badly damaged by fire.
4 The car jolted us badly over the rough road.
5 The engine is misfiring badly on one cylinder.
6 She was injured badly in the accident.
7 Badly fed children suffer a lot of minor illnesses.
8 The prison service is badly overstretched.
9 The front of the car was badly damaged.
10 His face was badly scarred by the fire.
11 They treat their children very badly.
12 Many of the refugees were suffering badly from thirst.
13 Badly written questions limit the usefulness of questionnaires.
14 He had been badly maltreated as a child.
15 I was badly treated by him.
16 The package had been badly crushed in the post.
17 Children who behave badly are rejecting adult values.
18 His plan to escape came badly unstuck.
19 The boat's interior badly needed painting.
20 It must have slipped up badly.
21 The company has been very badly managed.
22 The dress fitted badly and puckered at the waist.
23 I behaved badly yesterday and I am ashamed now.
24 His face was badly clawed by his little brother.
25 The instructions were badly written and unhelpful.
26 Many of the wounded had been badly disfigured.
27 The neighbourhood was badly damaged by enemy bombing.
28 He was badly hurt in the football match.
29 The passengers were badly shocked but unharmed.
30 Only for making me want you so badly.
More similar words: deadly, bad, a bad egg, deadline, headline, rapidly, friendly, hardly any, allegedly, supposedly, reportedly, repeatedly, upwardly mobile.