adverb
forsooth
fer-SOOTH/fərˈsuːθ/
Indeed or truly, used in old-fashioned or humorous speech.
Forsooth, you speak with the wisdom of a king!

Etymology
Sooth means truth; for- may intensify it, though the whole expression may instead mean 'for a truth.' Once a straightforward way to say 'indeed,' it came to sound affected, fitting its archaic or mock-serious use.
In context
Gloom, forsooth! Nobody would miss her. Her death would not matter a straw to anybody.
More examples
- Forsooth, this sandwich is a feast fit for royalty!
- The knight declares, “Forsooth, your words are true.”
- He expects applause, forsooth, for washing a single dish.
Forms
forsooth