Uncategorized Word-Built World: perfidious January 23, 2025 Mike Zonta Leave a comment Illustration: Anu Garg A.Word.A.Daywith Anu Garg perfidious PRONUNCIATION: (puhr-FID-ee-uhs) MEANING: adjective: Treacherous; deceitful. ETYMOLOGY: From Latin perfidus (treacherous), from per- (beyond) + fidus (faith). Earliest documented use: 1538.