The story
- Old English · inherited fromtrēowlīċe“faithfully; truly”
- Middle English · inherited fromtruely
- English todaytruly
From Middle English truely, treuly, treuli, trewely, treoweliche, treowliche, from Old English trēowlīċe (“faithfully; truly”), equivalent to true + -ly. Cognate with Dutch trouwelijk, Middle Low German truwlike, German treulich, Swedish trolig, Icelandic trygglega.
Etymology from Wiktionary, CC BY-SA 4.0.