Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pellax, ācis, adj. [pellicio], = ποικιλομήτης, seductive, deceitful (poet. and postclass.; cf.: fallax, falsus): invidia pellacis Ulixi, * Verg. A. 2, 90: Juppiter, Arn. 5, 188.