The word is spelt as you have done in the question.
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.
Worse is rarely used as a verb. When it is, the past and past participle is worsed.
The polocies of James Madison ^_^
The solution was inefficacious and only worsened the problem.
The policies of James Madison.
worsened the relations
Bored af
The spelling of the superlative of bad is worst(the different term baddest is slang).The food, any of a number of types of sausage, is spelled wurst.The past tense of the verb to worsen is worsened(became worse).
The economy of countries that have adopted the Euro has worsened with double dip recession. High unemployment, increase in public debt, and financial fragility is seen.