Improbable
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 15:12的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=improbable+etymology&newwindow=1&hl=en ref] late 16th century: from French, or from Latin…”的新页面）
late 16th century: from French, or from Latin improbabilis ‘hard to prove’, from in- ‘not’ + probabilis (see probable).
wiktionary
Borrowed from Middle French improbable, from im- + probable.
etymonline
improbable (adj.)
1590s, from assimilated form of in- (1) "not, opposite of" + probable, or else from Latin improbabilis. Related: Improbably.
