Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
intransĭtīvus, a, um, adj. [2. intranseo], gram. t. t., intransitive, i. e. that does not pass over to another person, Prisc. p. 982 P.
Adv.: intransĭtīvē, intransitively, Prisc. p. 1134 P.