Regrettable

来自Big Physics

wiktionary

ref 

regret +‎  -able


etymonline

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regrettable (adj.)

c. 1600, "deserving of regret, calling for regret," from regret + -able. "Common in recent use" [OED]. Related: Regrettably.

取自“https://www.bigphysics.org/index.php?title=Regrettable&oldid=50999”