bad /bæd/ adj.(worse, worst) 1.坏的；邪恶的，不道德的，不受欢迎的，劣质的：bad language 粗话，脏话；bad news 坏消息；bad weather 可恶的天气 It is bad to steal. 偷窃是坏事。He speaks bad English. 他说的英语很糟糕。2.病的，有害的，严重的：I’ve got a bad head. 我头不舒服。It’s bad for your eyes. 这对你眼睛不好。He has had a bad accident. 他出了件恶性事故。3.(食物等)腐烂：The egg was bad and smelt horrible. 蛋坏了，臭得要死。go bad(食物)变坏：Fish and meat soon go bad in hot weather. 在热天，鱼和肉变质很快。