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Worsened is a modifier meaning something became worse, or was made worse, than it had formerly been.
Person
It can be, for example: The situation has worsened, and many politicians was to spend a sleepless night, puzzling over what action to take next.
Instability in the Balkan region worsened from 1912 to 1913 because of minor wars.
The word is spelt as you have done in the question.