Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vĭdŭālis, e, adj. [vidua], of or belonging to a widow, widow-: pudicitia, Aug. Civ. Dei, 15, 26: depeculator depositi vidualis, Ambros. in Psa. 40, 27.