Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-spūto, āvi, ātum, 1, v. a. freq. [inspuo], to spit upon: ain’ eum mihi esse morbum, ut qui med opus sit insputarier? … quibus insputari saluti fuit, Plaut. Capt. 3, 4, 21; 43.