Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕdargūtĭo, ōnis, f. [redarguo], a refutation, reproof, defence: non habens in ore suo refutationes, Vulg. Psa. 37, 15: in redargutionem venire, to fall into contempt, be mocked at, id. Act. 19, 27; id. Psa. 37, 15; Boëth. Arist. Elench. 1 pr.