1、rain的形容词是rainy。

2、rain可以做名词和动词，做名词时意思就是雨水，做动词时意思为下雨。rainy是形容词，表示下雨的，多雨的。

3、双语例句：

I crept out into the rainy midnight and mooched home across Clapham Common.

我悄悄离开，在下着雨的午夜穿过克莱芬公园偷偷溜回家。

Gulches would flood in the rainy season but were dry now.

峡谷在雨季会被水淹没，但现在是干的。

For rainy days make sure you have alternate plans.

要确保雨天有备选计划。