superable (adj.)youdaoicibaDictYouDict[superable 词源字典]
"surmountable," 1620s, from Latin superabilis "that may be overcome," from superare "to overcome, surmount, go over, rise above," from super "over" (see super-) + -abilis (see -able). The negative formation insuperable is older and more common and superable may be a back-formation from it.[superable etymology, superable origin, 英语词源]