This is the 235th most frequent Estonian word.
muutunud
Changed.
Here, 'muutunud' acts as part of the main verb in a completed action, emphasizing the result of change over time.
Pärast aastat on olud muutunud.
After a year, the circumstances have changed.
In this sentence, 'muutunud' functions as a past participle in an auxiliary verb structure, indicating a change that has occurred.
Ta on muutunud positiivsemaks.
He has become more positive.
In this context, 'muutunud' again functions as a descriptive participle, indicating the current state resulting from a transformation.