Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. inceptus, a, um, Part., from incipio.
2. inceptus, ūs, m. [incipio], a beginning, undertaking (rare): foedum inceptu, foedum exitu, Liv. praef. 10: magno in omnia inceptu veneram, Sen. Ep. 108, 15: eriles, Val. Fl. 6, 124.