ill
单词辨析：
指患病的或身体不舒服的，通常作表语。
He is ill, so he didn't take part in the picnic.
他病了，所以没参加这次野餐。
She felt ill in the morning and decided to stay home.
她早上觉得不舒服，决定留在家里。
指健康状况不佳的，通常作表语。
She should rest well because she's been feeling poorly.
她一直感到身体不适，应该好好休息一下。
指在身体或精神上生病的，既可作表语又可作定语。
He is sick and cannot go to work.
他生病了，不能去上班。
More exercise will prevent you from getting sick.
多锻炼你就不会生病了。
Susan is looking after her sick mother.
苏珊在照顾她患病的母亲。
形容人时，特指道德上邪恶、不良的，程度强于 bad，含有加害于人、罪恶歹毒的意思；形容事物时，强调不道德的。
He is an evil man.
他是个邪恶的人。
They condemned racism as evil.
他们谴责种族主义是不道德的。
指品质、情况等坏的、糟糕的，或食物等有不良作用的，通常只作定语。
ill fame/health
坏名声/不健康
He has an ill temper.
他脾气很坏。
The chicken didn't taste fresh, but we suffered no ill effects.
那鸡肉尝起来不新鲜，但我们没有不良反应。
可用于修饰人或事物，强调有伤害他人感情或败坏其名声的意图的。
He authored a vicious personal attack on his rival.
他对对手发起了恶毒的人身攻击。
The girl was shocked by the vicious tone in his voice.
那姑娘被他恶毒的语气惊呆了。
指行为等不道德的。
It was wicked of you to drop litter in the park.
你在公园里乱扔垃圾可真缺德。
He'll be punished for his wicked conduct.
他的恶行会受到惩罚。
相关例句：
It's an ominous development that may bode ill for the Russian parliament.
进展很不顺利，对俄罗斯议会来说这可能是个坏兆头。
He didn't come today; perhaps he's ill.
他今天没来，许是生病了。
I was feeling ill
我觉得自己生病了。
She was so ill that she was put on a respirator.
她病得很严重，被戴上了人工呼吸器。
She had brought ill luck into her family
她给家庭带来了厄运。
Perhaps he's ill.
他也许病了。