The story
- Old French · derived fromtraitros
- Anglo-Norman · derived fromtraiterous
- Middle English · inherited fromtrayterous
- English todaytraitorous
From Middle English trayterous, traytrous, (also Middle English traytours, treytours), from Anglo-Norman traiterous, traitourous and Old French traitros.
Etymology from Wiktionary, CC BY-SA 4.0.