This is the 3470th most frequent Dutch word.
níét
The Dutch word "níét" means "not."
In this sentence, 'níét' is used to emphasize the negation of the verb 'willen' (to want), where the speaker strongly denies the willingness to make a purchase.
Ik wil dat níét kopen.
I do not want to buy that.
Here, 'níét' negates the statement about raining, with an implied emphasis to correct or contrast a belief.
Hij zei dat het níét regent, maar kijk toch buiten.
He said that it's not raining, but just look outside.
In this case, 'níét' is used to negate the advised action of driving in a particular way, stressing the warning aspect of the sentence.