Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
con-gĕnĭtus, a, um, Part. [gigno], born or produced together with (very rare; not ante-Aug.): pili, congenital, Plin. 11, 39, 94, § 230.
With dat.: vastitas roborum mundo, coëval with, Plin. 16, 2, 2, § 6; Tert. Test. Anim. c. 5.