waning
v. （月亮）亏缺；（尤指状况、感觉）衰落，减少（wane 的现在分词）
n. 减弱；月亏
adj. （月亮）渐亏的；逐渐减弱或变小的
例句
Moreover, the protesters are unlikely to go away, their confidence is growing rather than waning, their agendas are merging, the protests are spreading and drawing in all ages and concerns.
此外，抗议者不太可能离开，他们的信心正在增强而不是减弱，他们的议程正在合并，抗议活动正在蔓延，并吸引了各个年龄段的人和各方关注。
Her popularity clearly shows no sign of waning.
她的受欢迎程度显然没有显示出下降的迹象。
《柯林斯英汉双解大词典》
Her enthusiasm for the whole idea was waning rapidly.
她对整个想法的热情迅速冷淡了下来。
《牛津词典》
