Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lūmĭnātus, a, um, Part. and P. a., v. lumino.
lūmĭno, āvi, ātum, 1, v. a. [lumen], to light up, brighten, illumine (post-class.): tu luminas solem, regis mundum, App. M. 11, p. 269, 40: tellus floribus luminata, Marc. Cap. 1, § 27; § 66: locus fenestris luminatus, Cael. Aur. Acut. 1, 9.
Hence, lūmĭ-nātus, a, um, P a.: male luminatus, short-sighted, App. M. 9, p. 222, 32.