bored (adj.)youdaoicibaDictYouDict[bored 词源字典]
1823, past participle adjective from bore (v.) in the figurative sense.
Society is now one polished horde,
Formed of two mighty tribes, the Bores and Bored.
[Byron, "Don Juan," 1823]
[bored etymology, bored origin, 英语词源]