This is the 85th most frequent Finnish word.
vasta
"Vasta" in Finnish can mean "answer," "only just," "not until," or refer to a sauna whisk (a bundle of birch twigs).
Here, 'vasta-' is part of 'vastasi,' which is the past tense of the verb 'vastata,' meaning 'to answer.'
Hän vastasi kysymykseen älykkäästi.
He answered the question intelligently.
Here, 'vasta' means 'only,' referring to a recent time or event.
Opinnot alkoivat vasta viime kuussa.
The studies started only last month.
Here, 'vasta' means 'just now,' indicating a recent action.