Truthful
来自Big Physics
Safin(讨论 | 贡献)2022年4月27日 (三) 20:24的版本 (建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=truthful+etymology&newwindow=1&hl=en ref] Old English trīewth, trēowth ‘faithfulness…”的新页面)
Old English trīewth, trēowth ‘faithfulness, constancy’ (see true, -th2).
wiktionary
From truth + -ful.
etymonline
truthful (adj.)
"habitually speaking truth," 1590s, from truth + -ful. Related: Truthfully; truthfulness.