waning
['weɪnɪŋ]
adj.
（月亮）渐亏的，逐渐减弱或变小的;
n.
月亏;
v.
衰落( wane的现在分词 );
（月）亏;
变小;
变暗淡;
例句:
-
The moon was waning, and each day it rose later.
月亮渐亏，每天出现的时间也越来越晚。
-
Her popularity clearly shows no sign of waning.
她的受欢迎程度显然没有下降的迹象。
-
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。
-
Not to mention when it was a waning moon!
来自NEWYORKER
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Unity in the federation had been waning for some time.
来自BBC
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Now the oomph from inventories is waning.
来自WSJ