Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
luctĭfer, fĕra, fĕrum, adj. [luctus-fero], grief-bringing, mournful: illic luctifer bubo gemit, ill-boding, Sen. Herc. Fur. 687: annus, Val. Fl. 3, 454.