Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rīdĭcŭlōsus, a, um, adj. [ridiculus], laughable, facetious, droll (ante- and postclass.): parasitus ridiculosissimus, Plaut. Stich. 2, 2, 64: negotia, Arn. 5, 175: non ridiculosa ut scribis, sed ridicula mihi forte res accidit, not comical, but ridiculous, Hier. adv. Rufin. 3, 12.