Word Study
forsooth
CIDE DICTIONARY
In truth; in fact; certainly; very well; -- formerly used as an expression of deference or respect, especially to woman; now used ironically or contemptuously. [1913 Webster]
"A fit man, forsooth, to govern a realm!" [1913 Webster]
"Our old English word forsooth has been changed for the French madam." [1913 Webster]
forsooth, v. t.
To address respectfully with the term forsooth. [1913 Webster]
"The captain of the “Charles” had forsoothed her, though he knew her well enough and she him." [1913 Webster]
forsooth, n.
A person who used forsooth much; a very ceremonious and deferential person. [1913 Webster]
"You sip so like a forsooth of the city." [1913 Webster]
OXFORD DICTIONARY
forsooth, adv. archaic or joc. truly; in truth; no doubt.
Etymology
OE forsoth (as FOR, SOOTH)
THESAURUS
forsooth
absolutely, actually, and no mistake, assuredly, at all events, at any rate, by all means, certainly, clearly, decidedly, decisively, definitely, distinctly, factually, for a certainty, for a fact, for certain, for sure, historically, in fact, in reality, in truth, in very sooth, indeed, indeedy, most assuredly, most certainly, nothing else but, of a truth, of course, positively, really, really-truly, surely, to a certainty, truly, undoubtedly, unequivocally, unmistakably, verily, veritably, with truthROGET THESAURUS
forsooth
Affirmation
N affirmance, affirmation, statement, allegation, assertion, predication, declaration, word, averment, confirmation, asseveration, adjuration, swearing, oath, affidavit, deposition, avouchment, assurance, protest, protestation, profession, acknowledgment, legal pledge, pronouncement, solemn averment, solemn avowal, solemn declaration, remark, observation, position, saying, dictum, sentence, ipse dixit, emphasis, weight, dogmatism, dogmatics, asserting, declaratory, predicatory, pronunciative, affirmative, soi-disant, positive, certain, express, explicit, absolute, emphatic, flat, broad, round, pointed, marked, distinct, decided, confident, trenchant, dogmatic, definitive, formal, solemn, categorical, peremptory, unretracted, predicable, affirmatively, in the affirmative, with emphasis, ex-cathedra, without fear of contradiction, as God is my witness, I must say, indeed, i' faith, let me tell you, why, give me leave to say, marry, you may be sure, I'd have you to know, upon my word, upon my honor, by my troth, egad, I assure you, by jingo, by Jove, by George, troth, seriously, sadly, in sadness, in sober sadness, in truth, in earnest, of a truth, truly, perdy, in all conscience, upon oath, be assured, yes, I'll warrant, I'll warrant you, I'll engage, I'll answer for it, I'll be bound, I'll venture to say, I'll take my oath, in fact, forsooth, joking apart, so help me God, not to mince the matter, quoth he, dixi.For further exploring for "forsooth" in Webster Dictionary Online