Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praeceptīvē, adv., v. praeceptivus fin.
praeceptīvus, a, um, adj. [praecipio], preceptive, didactic (post-Aug.): pars philosophiae, quam Graeci παραινετικήν vocant, nos praeceptivam dicimus, Sen. Ep. 95, 1: portemus praeceptivo modo dicens, in the preceptive, hortatory mode, Tert. Res. Carn. 49; Ambros. Vid. 12, 73; id. in Luc. 6, 90.
Hence, adv.: praeceptīvē, preceptively, didactically (eccl. Lat.): portemus inquit, non portabimus, praeceptive, non promissive, Tert. adv. Marc. 5, 10.