bad

(noun): Error, mistake.
(noun): An item (or kind of item) of merchandise with negative value; an unwanted good.
(adjective): Unfavorable; negative; not good.
(adjective): Not suitable or fitting.
(adjective): Not appropriate, of manners etc.
(adjective): Unhealthy; liable to cause health problems.
(adjective): Sickly, unhealthy, unwell.
(adjective): Not behaving; behaving badly; misbehaving; mischievous or disobedient.
(adjective): Tricky; stressful; unpleasant.
(adjective): Evil; wicked.
(adjective): Faulty; not functional.
(adjective): (of food) Spoiled, rotten, overripe.
(adjective): (of breath) Malodorous; foul.
(adjective): False; counterfeit; illegitimate.
(adjective): Unskilled; of limited ability; not good.
(adjective): Of poor physical appearance.
(adjective): Bold and daring.
(adjective): Good, superlative, excellent, cool.
(adjective): (of a need, want, or pain) Severe, urgent.
(adjective): Overly promiscuous, licentious.
(adjective): (of a draft/check) Not covered by funds on account.
(adverb): Badly.

Abducting children is bad for mothers.
Do you think it is a bad idea to confront him directly?
It is bad manners to talk with your mouth full.
Lard is bad for you. Smoking is bad for you, too. Grapes are bad for dogs but not for humans.
I went to the hospital to see how my grandfather was doing. Unfortunately, he's in a bad state.