Jaded
/ˈdʒeɪdɪd/ adjective easyWorn out and cynical from having too much experience with something, especially something unpleasant.
After ten years of covering scandals, the reporter had grown jaded about politicians' promises.
Memory Trick
Originally described a worn-out, exhausted horse called a 'jade' — a jaded person feels just as used-up and weary as that old horse.