The story
- Old English · inherited fromtrēownes
- Middle English · inherited fromtreunesse
- English todaytrueness
From Middle English treunesse, trewenesse, from Old English trēownes, equivalent to true + -ness. Cognate with West Frisian trouwens (“trueness, faithfulness, fidelity”).
Etymology from Wiktionary, CC BY-SA 4.0.