这两个形容词均含“羞愧的”之意。
ashamed ：用于人，指因干了错事、坏事或傻事等而感到羞愧。
- His daughter looked such a mess that he was ashamed of her.
他为女儿的邋遢样子感到害臊。 - You should be ashamed of yourself for telling such lies.
你扯这种谎应该感到羞耻。
shameful ：指人或人的行为本身不光彩、不道德。
- The idea that she witnessed this shameful incident meant nothing to him.
虽然她目睹了这可耻的一幕，但是这对他来说无关紧要。 - Only those who have no sense of shame can do such shameful things.
只有不要脸的人才能做出这样不要脸的事。
