He admitted a lack of motivation and a feeling of sloth.

他承认自己缺乏动力，感觉懒散。

《柯林斯英汉双解大词典》

She couldn't help feeling a little piqued by his lack of interest.

她不禁对他的淡漠感到有些不乐。

《牛津词典》

We realize this truth by turning our attention directly into the feeling of lack.

我们可以通过把注意力转移到缺失的感觉上来发现这个真相。

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For example, one of the symptoms is a lack of feeling in one part of the body or another.

VOA: special.2009.01.06

In fact, Kessler notes that 20% of healthy weight and 50% of obese individuals score high on behaviors like loss of control over eating, lack of feeling satisfied by eating food, and preoccupation with food.

CNN: Why do I always think about food?

During the operations to overthrow the Taliban in 2001, I sometimes found the lack of fellow feeling or sympathy among Afghans quite breath-taking, for example when civilians in some far off place were killed accidentally by American bombing.

BBC: How Afghans will view Kandahar killing spree

None of them have ever made remarks about feeling a lack from Christmases past.

FORBES: Why I Withhold Presents From My Children