不
Pinyin: bù
not; no
Example sentence
我不是老师。
Wǒ bù shì lǎoshī.
I am not a teacher.
What 不 means
不 (bù) is a Chinese word meaning “not; no”. It belongs to the Particles & Phrases topic and appears at HSK 1, so it is one of the words worth learning early when you study Chinese.