Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
2. immĭnūtus (inm-), a, um, adj. [in-minutus], undiminished, unimpaired, unviolated (post-class.): jus suum habere imminutum, Dig. 24, 2, 6; 38, 2, 44.