bad、evil、ill、poor与wicked这些形容词均含“坏的”之意。

bad : 含义广泛，指任何不好的或不合需要的品质。

• Our holiday was spoiled by bad weather.
  我们的假期全被坏天气给破坏了。
• We've just had some very bad news.
  我们刚刚得到了一些很不好的消息。
• I had a very bad night (= did not sleep well) last night.
  我昨晚没有睡好。
• Watch out - he's in a bad mood (= being unpleasant to everyone).
  小心——他心情不好。
• She's just a bad loser (= she is unpleasant when she loses).
  她这人输不起。
• The company has been getting a lot of bad publicity (= negative things have been written or said about it) recently.
  该公司最近在媒体上的负面新闻很多。

evil : 语气比bad强，强调道德上的邪恶不良，含狡猾凶险或危害他人的意味。

• an evil dictator
  邪恶的独裁者
• These people are just evil.
  这些人太恶毒了。

ill与evil意义接近，但语气弱一些，常指道德或性质方面的不良。

• ill health
  糟糕的健康状况
• Did you experience any ill effects from the treatment?
  你感到治疗有什么副作用吗？

poor : 普通用词，侧重指事物的质量或数量低于标准或不合要求。用于指天气与食品时可与bad通用。

• a poor harvest
  歉收
• Last year's exam results were fairly poor.
  去年的考试成绩相当差。
• I was always very poor at maths at school.
  我上学时数学一直很差。
• Dad had been in poor health for several years.
  爸爸几年来健康状况一直很差。
• At last month's meeting, attendance was poor.
  上个月的会议出席率很低。

wicked : 语气比evil强，指居心叵测，任意违反道德标准，有意作恶。

• It was a wicked thing to do.
  那是件缺德的事。
• Of course, in the end, the wicked witch gets killed.
  当然，最后邪恶的巫婆被杀掉了。