Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* stultĭlŏquĭum, ii, n. [stultiloquus], silly talk, babbling, stultiloquy, Plaut. Mil. 2, 3, 25; Hier. Eph. 5, 3; Vulg. Eph. 5, 4.