a.
1. 發瘋的,發狂的
She went mad after the death of her son.
兒子死後她就瘋了。
2. 瘋狂的,狂熱的[(+with)]
3. 愚蠢的;魯莽的
It was a mad idea to climb the mountain in this bad weather.
在這種壞天氣去爬山真是愚蠢。
4. 【口】狂熱的,著迷的[F][(+about/on/for)]
Both brothers are mad about tennis.
兄弟倆對網球都很入迷。
5. 【口】惱火的[F][(+at/with)]
Don't be mad at me.
不要對我大發脾氣。