After a fruitless morning sitting at his desk he had given up.他在书桌前徒劳地坐了一上午之后便放弃了。It was a fruitless search.搜寻工作毫无结果。Their search for the plane is fruitless.他们对飞机的搜寻是毫无结果的....

黏性，发粘，湿冷...