Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lūdī̆brĭōsus, a, um, adj. [ludibrium], full of mockery or scorn, mocking, scornful (post-class.): probra ludibriosa, Gell. 7, 11: auspicia, Amm. 15, 5, 25.
Hence, adv.: lūdī̆brĭosē, scornfully, Amm. 26, 6; Tert. Res. Carn. 61.