Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
complōrātĭo (conp-), ōnis, f. [comploro], a loud, violent complaint, lamentation, esp. by several persons (several times in Liv., elsewhere rare; not ante-Aug.): lamentabilis mulierum, Liv. 3, 47, 6; cf. id. 1, 41, 6; 26, 29, 2; 40, 9, 7; 41, 11, 5; Just. 11, 9, 13; Gell. 10, 3, 7.
Of one person: sororis, Liv. 1, 26, 3.