fallaci
fallaci is a Latin form of fallax, meaning “deceitful, deceptive, false”. It is the dative singular adjective.
Found 38 times in the Latin texts on Socratos.
Where it is used
Cicero, Philippicae 12.7: quod si est erratum, patres conscripti, spe falsa atque fallaci, redeamus in viam. optimus est portus paenitenti mutatio consili. quid enim potest, per deos immortalis! rei …
All forms of fallax (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.