4、gleeful
adj. 欣喜的; 高兴的; 令人愉快的;
【例句】He took an almost gleeful delight in showing how wrong they can be.
他几乎是幸灾乐祸地指出他们大错特错。
5、tactful
adj. 婉转; 得体的; 机智的，机敏的; 老练的.，圆滑的;
【例句】He had been extremely tactful in dealing with the financial question
他在处理这个财务问题时很有分寸。
6、hopeful 英[hpfl] 美[hopfl]
adj. 抱有希望的; 给人以希望的;
n. 有成功希望的人;
【例句】I am hopeful this misunderstanding will be rectified very quickly
我相信这个误会将很快得到纠正。