swivel-eyed       
adjective informal UK uk/ˈswɪv.əlˌaɪd/ us/ˈswɪv.əlˌaɪd/
 疯狂的,极端的(极具侮辱性的说法)
an insulting way to describe someone as crazy or as having very extreme ideas
  The press has characterized him as a swivel-eyed fanatic. 媒体把他描述成一个极端狂热分子。 
 - More examples
- He is trying to ward off the opposition's charges that he is a swivel-eyed extremist.
- Puritanism produces swivel-eyed zealots who pursue their manias with little sense of proportion.
- To him they are "swivel-eyed Europhobes, hangers and floggers."
- The opposing camp referred to him as "a swivel-eyed Stalinist".
- He plays a swivel-eyed loon called Basil Fawlty who runs a small hotel.