Unstable
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 11:48的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/unstable ref] un- + stable == etymonline == [https://www.etymonline.com/word/unsta…”的新页面）
wiktionary
un- + stable
etymonline
unstable (adj.)
early 13c., "apt to move," from un- (1) "not" + stable (adj.). Similar formation in Middle High German unstabel. Meaning "liable to fall" is recorded from c. 1300; sense of "fickle" is attested from late 13c. An Old English word for this was feallendlic, which might have become *fally.
