What is the meaning of bad?

noun

• That which is below standard or expectations as of ethics or decency.
  • usage: "take the bad with the good"
  • synonyms: badness

adjective

• Having undesirable or negative qualities.
  • usage: "a bad report card"; "his sloppy appearance made a bad impression"; "a bad little boy"; "clothes in bad shape"; "a bad cut"; "bad luck"; "the news was very bad"; "the reviews were bad"; "the pay is bad"; "it was a bad light for reading"; "the movie was a bad choice"
• Very intense.
  • usage: "a bad headache"; "in a big rage"; "had a big (or bad) shock"; "a bad earthquake"; "a bad storm"
  • synonyms: big
• Feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad'. )
  • usage: "my throat feels bad"; "she felt bad all over"; "he was feeling tough after a restless night"
  • synonyms: tough
• Of foodstuffs. ( not in an edible or usable condition)
  • usage: "bad meat"; "a refrigerator full of spoilt food"
  • synonyms: spoiled, spoilt
• Feeling or expressing regret or sorrow or a sense of loss over something done or undone.
  • usage: "felt regretful over his vanished youth"; "regretful over mistakes she had made"; "he felt bad about breaking the vase"
  • synonyms: regretful, sorry
• Not capable of being collected.
  • usage: "a bad (or uncollectible) debt"
  • synonyms: uncollectible
• Below average in quality or performance.
  • usage: "a bad chess player"; "a bad recital"
• Nonstandard.
  • usage: "so-called bad grammar"
• Not financially safe or secure.
  • usage: "a bad investment"; "high risk investments"; "anything that promises to pay too much can't help being risky"; "speculative business enterprises"
  • synonyms: risky, high-risk, speculative
• Physically unsound or diseased.
  • usage: "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth"
  • synonyms: unfit, unsound
• Capable of harming.
  • usage: "bad air"; "smoking is bad for you"
• Characterized by wickedness or immorality.
  • usage: "led a very bad life"
• Reproduced fraudulently.
  • usage: "like a bad penny..."; "a forged twenty dollar bill"
  • synonyms: forged
• Not working properly.
  • usage: "a bad telephone connection"; "a defective appliance"
  • synonyms: defective

adverb

• With great intensity (`bad' is a nonstandard variant for `badly'. )
  • usage: "the injury hurt badly"; "the buildings were badly shaken"; "it hurts bad"; "we need water bad"
  • synonyms: badly
• Very much; strongly.
  • usage: "I wanted it badly enough to work hard for it"; "the cables had sagged badly"; "they were badly in need of help"; "he wants a bicycle so bad he can taste it"
  • synonyms: badly