Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
impransus (inpr-), a, um, adj. [2. inpransus], that has not breakfasted, fasting: quia illo die impransus fui, Plaut. Am. 1, 1, 98: verum hic impransi mecum disquirite, Hor. S. 2, 2, 7; Plaut. Am. 3, 2, 71; id. Rud. 1, 2, 56; Hor. S. 2, 3, 257; id. Ep. 1, 15, 29 al.