Word of the Day: Perfidious

Can you pronounce perfidious?

January 28, 2026

Today's Word Brought to You By adjective 1. Of, relating to, or characterized by perfidy (the quality or state of being faithless or disloyal). Today's Word Brought to You By   Costco Members: This New Policy Is a Game Changer Do you shop at Costco? Then you know the thrill of saving money. But you might be missing other smart ways to stretch your dollars. Check out this list of genius money hacks — almost as good as that $1.50 hot dog! Learn More *This content is brought to you by our sponsor, which helps keep our content free. "Everyone knew the deal fell apart due to a perfidious promise that was broken at the last minute." "The novel's tension hinges on a perfidious ally who pretends loyalty until the final chapter." "My perfidious neighbor greets everyone with a smile while she also spreads rumors down the block." Latin, mid-16th century Do you have a rival? Perhaps someone that you keep an eye on because you can't trust what they say? This adjective, from the Latin "perfidia" (meaning "treachery"), would aptly describe ... Continue Reading 10 Costco Hacks to Help You Save Even More Think you know all the ways to save at Costco? Think again. These unexpected tips and tricks can help you stretch your membership even further — because smart shopping goes beyond buying in bulk. Learn More *This content is brought to you by our sponsor, which helps keep our content free. Do you remember these words?

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