forsooth
adverb·/fɔːrˈsuːθ/
In truth. Indeed. An emphatic or sometimes ironic intensifier, now chiefly in archaic or mock-archaic style. Where plain indeed is neutral, forsooth carries a faint stage-light: sincerity performed, or sincerity parodied.
"Forsooth," he said with a bow, and the room understood at once that he was teasing.
Etymology
From Middle English for sothe “for truth,” from for “for” + sooth “truth.” The word preserves sooth, once a common noun, inside a fossil phrase that still tastes of old seriousness.
Related Words
soothtruth; largely archaic outside set phrases
soothsayertruth-speaker; prophetic sense
verilyanother archaic “indeed”
indeedmodern equivalent