perfidiosus

Latin

Etymology

From perfidia (“perfidy”) +‎ -ōsus (“-ous”), from perfidus (“faithless”) +‎ -ia (“-ness”), from per (“through”) + fidēs (“trust”), from Proto-Indo-European *per + Proto-Italic *feiðos from root *bʰeydʰ-.

Pronunciation

• (Classical Latin) IPA^(key): /per.fi.diˈoː.sus/, [pɛrfɪd̪iˈoːs̠ʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /per.fi.diˈo.sus/, [perfid̪iˈɔːs̬us]

Adjective

perfidiōsus (feminine perfidiōsa, neuter perfidiōsum, comparative perfidiōsior); first/second-declension adjective

1. treacherous, perfidious

Declension

First/second-declension adjective.

Number	Singular				Plural
Case / Gender	Masculine	Feminine	Neuter		Masculine	Feminine	Neuter
Nominative	perfidiōsus	perfidiōsa	perfidiōsum		perfidiōsī	perfidiōsae	perfidiōsa
Genitive	perfidiōsī	perfidiōsae	perfidiōsī		perfidiōsōrum	perfidiōsārum	perfidiōsōrum
Dative	perfidiōsō		perfidiōsō		perfidiōsīs
Accusative	perfidiōsum	perfidiōsam	perfidiōsum		perfidiōsōs	perfidiōsās	perfidiōsa
Ablative	perfidiōsō	perfidiōsā	perfidiōsō		perfidiōsīs
Vocative	perfidiōse	perfidiōsa	perfidiōsum		perfidiōsī	perfidiōsae	perfidiōsa

Related terms

• perfidē
• perfidia
• perfidiōsē
• perfidus

Descendants

• English: perfidious

References

• “perfidiosus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “perfidiosus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• perfidiosus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette, page 1146.
• perfidiosus in Georges, Karl Ernst, Georges, Heinrich (1913–1918) Ausführliches lateinisch-deutsches Handwörterbuch, 8th edition, volume 2, Hahnsche Buchhandlung, column 1589