Added 10 October 2026 backstabber /ˈbækˌstæbɚ/ noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about backstabber at Wordnik → Where our words come from → A traitor or hypocrite, such as a co-worker or friend assumed trustworthy but who figuratively attacks when one's back is turned. Origin From back + stabber. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: traitorbackstabbeeturncoatdouble-crosserbackbiteturn-coatcotraitorbackbiterbetrayer Back to today's word