Fiercely
来自Big Physics
Safin(讨论 | 贡献)2022年4月27日 (三) 08:05的版本 (建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=fiercely+etymology&newwindow=1&hl=en ref] Middle English: from Old French fiers ‘fierce…”的新页面)
Middle English: from Old French fiers ‘fierce, brave, proud’, from Latin ferus ‘untamed’.
wiktionary
From Middle English fersly; equivalent to fierce + -ly.