idleness (n.)youdaoicibaDictYouDict[idleness 词源字典]
Old English idelnes "frivolity, vanity, emptiness; vain existence;" see idle + -ness. Old English expressed the idea we attach to in vain by in idelnisse. Spenser, Scott, and others use idlesse to mean the same thing in a positive, pleasant sense.[idleness etymology, idleness origin, 英语词源]