Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
tortŭōsĭtas, ātis, f. [tortuosus], crookedness, shuffling, prevarication (late Lat.): qualis est tortuositas vestra? Tert. adv. Marc. 4, 43 fin.; so id. Carn. Chr. 20.