Bad

that which is below standard or expectations as of ethics or decency

having undesirable or negative qualities

very intense

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

(of foodstuffs) not in an edible or usable condition

feeling or expressing regret or sorrow or a sense of loss over something done or undone

not capable of being collected

below average in quality or performance

nonstandard

not financially safe or secure

physically unsound or diseased

capable of harming

characterized by wickedness or immorality

reproduced fraudulently

not working properly

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

very much