This is the 9th most frequent Estonian word.
nii
The Estonian word "nii" means "so" or "thus" in English.
Here, 'nii' is used as an adverb to intensify the adjective 'beautifully'.
Ta laulis nii ilusti, et kõik jäid kuulama.
She sang so beautifully that everyone listened.
In this case, 'nii' is used as a pronoun meaning 'so' or 'thus', describing the manner or way something happened.
Nii see juhtus, kui me ei olnud valmis.
That's how it happened when we were not prepared.
Here, 'nii' serves as a conjunction meaning 'the way', used to compare or specify the method or manner of an action.