Used before certain two-syllable adjectives to emphasize degree, equivalent to "very" or "how"; as in 好不热闹 hǎo​bù​rè​nao

Not at all; quite the opposite of the adjective that follows.

(colloquial) Used at the end of a sentence to ask for agreement or permission, similar to "is that okay?" or "alright?".

Used before certain adjectives to express a negative degree, meaning "not very" or "hardly"; as in 好不识人 hǎo​bù​shí​rén

Used in certain fixed patterns where it means the same as its positive counterpart, notably in 好不容易 hǎo​bù​róng​yì meaning "very difficult"