This is the 13th most frequent Finnish word.
niin
The Finnish word "niin" means "so," "thus," or "as."
In this sentence, 'niin' enhances the adjective 'kaunista' (beautiful), conveying the extent as 'so'.
Se oli niin kaunista.
It was so beautiful.
Here, 'niin' points back to earlier mentioned or implied information, meaning 'so' or 'that way'.
Jos se on niin, me lähdemme heti.
If it is so, we will leave immediately.
In this example, 'niin' initiates or transitions to a new topic, often translated as 'so' in English to start a sentence.