Definition of forsooth in English:

forsooth

Pronunciation /fərˈso͞oTH/ /fərˈsuθ/

Translate forsooth into Spanish

adverb

archaic, humorous sentence adverb
  • Indeed (often used ironically or to express surprise or indignation)

    ‘forsooth, there is no one I trust more’
    • ‘‘Ah, forsooth, and is it your worship indeed?‘cried the good dame.’
    definitely, certainly, unquestionably, undoubtedly, positively, without doubt, without a doubt, beyond any doubt, beyond doubt, beyond question, unmistakably, indubitably, undeniably, beyond the shadow of a doubt, surely, assuredly

Origin

Old English forsōth(see for, sooth).