n.瘋子

adj.瘋狂的；極蠢的

People in this town know him as a lunatic. 這個(gè)鎮(zhèn)上的人們稱他為瘋子。

I really don't know what kind of man he really is; on one occasion, he is normal, and on another, he acts like a lunatic. 我真不了解他到底是怎樣的人; 一會(huì)兒正常，一會(huì)兒又像個(gè)瘋子。

The man's lunatic behavior is a menace to society. 那個(gè)人的瘋狂行為構(gòu)成對(duì)社會(huì)的威脅。