Worsened is a modifier meaning something became worse, or was made worse, than it had formerly been.
The word is spelt as you have done in the question.
To ameliorate is to improve. To pejorate is to worsen. So in this case, you would have to look at whether the connotative meaning of the word "doom" has worsened or gotten better. My best guess is that it has probably worsened, so it would be pejoration.
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 policies of James Madison.
The solution was inefficacious and only worsened the problem.
The polocies of James Madison ^_^
Bored af
worsened the relations
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.
As time progressed conditions worsened.