Definitions of bad:

• noun:   that which is below standard or expectations as of ethics or decency

  Example: "Take the bad with the good"

• adjective:   very intense

  Example: "A bad headache"

• adjective:   not financially safe or secure

  Example: "A bad investment"

• adjective:   nonstandard

  Example: "So-called bad grammar"

• adjective:   below average in quality or performance

  Example: "A bad chess player"

• adjective:   not capable of being collected

  Example: "A bad (or uncollectible) debt"

• adjective:   feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')

  Example: "My throat feels bad"

• adjective:   (of foodstuffs) not in an edible or usable condition

  Example: "Bad meat"

• adjective:   not working properly

  Example: "A bad telephone connection"

• adjective:   reproduced fraudulently

  Example: "Like a bad penny..."

• adjective:   having undesirable or negative qualities

  Example: "A bad report card"

• adjective:   characterized by wickedness or immorality

  Example: "Led a very bad life"

• adjective:   keenly sorry or regretful

  Example: "Felt bad about letting the team down"

• adjective:   capable of harming

  Example: "Bad habits"

• adjective:   physically unsound or diseased

  Example: "Has a bad back"

• adverb:   very much; strongly

  Example: "I wanted it badly enough to work hard for it"

• adverb:   with great intensity (`bad' is a nonstandard variant for `badly')

  Example: "The injury hurt badly"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #17894)