They show either a lack of enthusiasm or an excess of it.

他们要么表现出缺乏热情，要么表现出过度热情。

youdao

She wrinkled her nose, piqued by his total lack of enthusiasm.

她皱了皱鼻子，对他缺乏兴趣而不满。

《柯林斯英汉双解大词典》

My parents were concerned at my apparent lack of enthusiasm for school.

我看来对上学不感兴趣，使父母担心。

《牛津词典》

It was the first manned mission to orbit the moon. "NASA has been burdened with a lack of enthusiasm by the taxpayers."

VOA: standard.2010.04.15

Another big obstacle to reform could be a lack of enthusiasm among local governments.

ECONOMIST: The government��s plans are still something of a mystery

Most business presentations are dreadful boring, platitudinous, and delivered with a compelling lack of enthusiasm.

FORBES: The Only Reason To Give A Speech In 2011

The lack of enthusiasm in 2010 allowed Republicans to sweep into power one state after another.

FORBES: The Impotence of the Democratic Base