tasteless (adj.)youdaoicibaDictYouDict[tasteless 词源字典]
1590s, "unable to taste;" c. 1600, "uninteresting, insipid" (figurative); 1610s, "having no taste;" 1670s, "tactless;" from taste (n.) + -less. Related: Tastelessly; tastelessness.[tasteless etymology, tasteless origin, 英语词源]