perfide

perfide is a Latin form of perfidus, meaning “faithless, treacherous”. It is the vocative singular masculine adjective.

Found 33 times in the Latin texts on Socratos.

Where it is used

Vergil, Aeneid 4.305: Dissimulare etiam sperasti, perfide, tantum

Ovid, Heroides 10.58: Perfide, pars nostri, lectule, maior ubi est?'

All forms of perfidus (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.