Stressed - has stress, stress is affecting him Stressful - causes stress He is stressed because he has a stressful job.

The same as the difference between "interesting" and "interested" or "boring" and "bored". -ing and -ful: 让别人觉得这样 -ed: 自己觉得这样 This test is very stressful. It makes me feel very stressed. First dates are very stressful for everyone involved. I felt stressed at the job interview. The teacher is very boring. When he talks, all of his students are bored.