noun

1. Error, mistake.

2. An item (or kind of item) of merchandise with negative value; an unwanted good.

adjective

1. Unfavorable; negative; not good.

   “Abducting children is bad for mothers.”

2. Not suitable or fitting.

   “Do you think it is a bad idea to confront him directly?”

3. Not appropriate, of manners etc.

   “It is bad manners to talk with your mouth full.”

Synonyms: badass, evil, vicious, vile, wicked, false, spurious, unhealthful

adverb

1. Badly.

   “I didn't do too bad in the last exam.”