Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-cĕlebrātus, a, um, adj., not made known, not spread abroad (post-Aug.): ab aliis incelebrata (opp. digna cognitu), Tac. A. 6, 7 fin.: multa per invidiam scriptorum incelebrata sunt, Sall. H. Fragm. 1, 57 Kritz (dub.; Dietsch reads celata).