Hi. I am looking for a noun or adjective describing a person who does consipracy against his own country. I can think of the following words, but I don't think if any of them precisely describes such a person.
Hi Clive. Thank you for your response. As for the type of conspiracy, for an instance when his country is in war, he/she might help the other country to win the battle against his home country. I think, if this conspiracy is limited to giving information, we can call it mole as well. Right? Thank you Hamid
Clive and Alpheccastar have mentioned incisive remarks, but adding to those I can think of "spy" and "quisling" which the latter has an interesting etymology. This word has been rooted from the name of a Norwegian officer who betrayed his own country for the benefit of N.a.z.i.s during the World War II. And from then after this word became a meaningful vocabulary in English.