Not good or enjoyable.
The weather was bad, so we stayed indoors.
天氣很差,所以我們待在室內。
Not of good quality.
This bread is bad; it's stale.
這個麵包壞了;它不新鮮了。
Very serious or severe.
He had a bad accident.
他遭遇了一場嚴重的事故。
Not suitable or appropriate.
It's bad to be late for an important meeting.
遲到重要會議是不好的。
Morally wrong.
Stealing is bad.
偷竊是不好的。
Behaving badly.
He's been bad all day.
他一整天都表現不好。
Not skilled at something.
She's bad at math.
她數學不好。
Harmful or damaging.
Smoking is bad for your health.
吸菸對你的健康有害。
Painful or uncomfortable.
I have a bad knee.
我的膝蓋不好。
Spoiled or rotten.
The milk has gone bad.
牛奶變質了。
Annoyed or angry.
I'm in a bad mood today.
我今天心情很差。
Feeling guilty or regretful.
I feel bad about forgetting your birthday.
我忘記你的生日,感覺很糟糕。
Feeling ill.
I'm not feeling good; in fact, I feel bad.
我感覺不舒服;實際上,我感覺不好。
Excellent, used in informal contexts.
That concert was bad!
那場音樂會很差!
Negative aspects or people.
There's a lot of bad in the world, but also a lot of good.
世界上有很多不好的事情,但也有很多好的事情。
In a bad way.
She wanted to know how bad the damage was.
她想知道損壞有多嚴重。