【loopy】[形]
1. ループ［輪］の多い
2. 〈話〉頭のおかしい、気の狂った、ばかげた、愚かな

[用法]
By far the biggest loser of the extravaganza was the hapless and (in the opinion of some Obama administration officials) increasingly loopy Japanese Prime Minister Yukio Hatoyama.
"Among leaders at summit, Hu's first" By Al Kamen, April 14, 2010, The Washington Post

[参考]

「哀れでますますいかれた鳩山首相」…米紙酷評