in a way that shows that you are extremely interested in something, to a degree that some people find unreasonable

The band has a fanatically loyal following. 这支乐队拥有一批狂热的忠实粉丝。

They have been competing fanatically for years. 多年来，他们一直在狂热地竞争。

in a way that shows that you hold extreme beliefs that may lead to unreasonable or violent behaviour

He attended a nearby church, but he did not appear fanatically religious. 他去附近的教堂，但他看起来并不狂热地信教。

When people are fanatically dedicated to political dogmas or goals, it's always because these dogmas or goals are in doubt. 当人们狂热地忠诚于政治教条或目标时，总是因为这些教条或目标受到了怀疑。