'Forsooth' in the Bible

when one told me, saying, Behold, Saul is dead! and he was in his own sight a messenger of good, I took hold of him, and slew him in Ziklag to whom forsooth I should give a reward for his good tidings:

All thine enemies open their mouth against thee, they hiss and gnash the teeth: they say, We have swallowed her up; this is forsooth the day that we looked for: we have found, we have seen it.