indistinct (adj.)youdaoicibaDictYouDict[indistinct 词源字典]
c. 1400 (implied in indistinctly "equally, alike"), from Latin indistinctus "not distinct, confused," from in- "not, opposite of" (see in- (1)) + distinctus (see distinct). Related: Indistinctly; indistinctness.[indistinct etymology, indistinct origin, 英语词源]