This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. In truth; indeed.

ad. indeed, truthfully, really

ad. In truth; in fact; certainly; very well; -- formerly used as an expression of deference or respect, especially to woman; now used ironically or contemptuously.

v. To address respectfully with the term forsooth.

n. A person who used forsooth much; a very ceremonious and deferential person.

In truth; in fact; certainly; very well: now commonly used ironically.

[Being formerly common as an affected garnish of polite conversation, forsooth came to be regarded as noting a ladies' man, and was occasionally used, allusively, as a noun or a verb.

ad. an archaic word originally meaning `in truth' but now usually used to express disbelief

""Attacked!" repeated Wolfe, -- "attacked!" and then suddenly sinking his voice into a sort of sneer, "why, since the event which this painting is designed to commemorate, I know not if we have ever had one solitary gleam of liberty break along the great chaos of jarring prejudice and barbarous law which we term forsooth a glorious constitution."

certainly    truly