Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Pompĭlĭus, a, name of a Roman gens. The most celebrated is Numa Pompilius, the second king of Rome, Hor. C. 1, 12, 34; Ov. F. 2, 69; Liv. 1, 18.
Hence,