toothless (adj.)youdaoicibaDictYouDict[toothless 词源字典]
Old English toðleas, in the literal sense; see tooth + -less. Figurative sense of "dull" is recorded from 1590s; that of "lacking enforcement powers" is first recorded 1961. Related: Toothlessly; toothlessness.[toothless etymology, toothless origin, 英语词源]