bad¹ (băd)

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[Middle English badde.]

adjective: worse (wûrs), worst (wûrst) 

1. Not achieving an adequate standard; poor: a bad concert.
2. Evil; sinful.
3. Vulgar or obscene: bad language.
4. Informal Disobedient or naughty: bad children.
5. Disagreeable, unpleasant, or disturbing: a bad piece of news.
6. Unfavorable: bad reviews for the play.
7. Not fresh; rotten or spoiled: bad meat.
8. Injurious in effect; detrimental: bad habits.
9. Not working properly; defective: a bad telephone connection.
10. Full of or exhibiting faults or errors: bad grammar.
11. Having no validity; void: passed bad checks.
12. Being so far behind in repayment as to be considered a loss: bad loans.
13. Severe; intense: a bad cold.
14. 1. Being in poor health or in pain: I feel bad today.
    2. Being in poor condition; diseased: bad lungs.
15. Sorry; regretful: She feels bad about how she treated you.
16. Slang Very good; great.

noun 

Something that is below standard or expectations, as of ethics or decency: weighing the good against the bad.

adverb 

Badly.

idioms

in bad

In trouble or disfavor.

my bad

Used to acknowledge that one is at fault.

not half bad

Reasonably good.

derivatives

bad́ness

noun

usage note

Usage Note: Bad is often used as an adverb in sentences such as The house was shaken up pretty bad or We need water bad. This usage is common in informal speech but is widely regarded as unacceptable in formal writing. In an earlier survey, the sentence His tooth ached so bad he could not sleep was unacceptable to 92 percent of the Usage Panel. · The use of badly with want was once considered incorrect but is now entirely acceptable: We wanted badly to go to the beach.  · The adverb badly is often used after verbs such as feel, as in I felt badly about the whole affair. This usage bears analogy to the use of other adverbs with feel, such as strongly in We feel strongly about this issue. Some people prefer to maintain a distinction between feel badly and feel bad, restricting the former to emotional distress and using the latter to cover physical ailments; however, this distinction is not universally observed, so feel badly should be used in a context that makes its meaning clear. ·  Badly is used in some regions to mean “unwell,” as in He was looking badly after the accident. Poorly is also used in this way. In an earlier survey, however, the usage was found unacceptable in formal writing by 75 percent of the Usage Panel.