ill

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

ill, sick

这两个形容词均有“生病的”之意。
ill: 在英国较常用，指“生病”时，通常作表语，不可作定语。在美国，ill用作表语时可与sick换用。
sick: 多用于美国，作“生病”解时，既可作表语，也可作定语。在英国，sick作表语，不指生病，而指“恶心、呕吐”。

名词 ill:

1. an often persistent bodily disorder or disease; a cause for complaining
   同义词：ailment, complaint

形容词 ill:

1. affected by an impairment of normal physical or mental function
   同义词：sick
2. resulting in suffering or adversity
3. distressing
4. indicating hostility or enmity
5. presaging ill fortune
   同义词：inauspicious, ominous

副词 ill:

1. (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well
   同义词：badly, poorly
2. unfavorably or with disapproval
   同义词：badly
3. with difficulty or inconvenience; scarcely or hardly

1. They had to shelve their holiday plans because their son was ill.
   他们不得不把度假计划搁置，因为他们的儿子病了。
2. My husband was a great comfort to me when my son was ill.
   我儿子生病时，丈夫给了我极大的安慰。
3. You should not speak ill of your friend.
   你不应该说你朋友的坏话。
4. Did you really feel ill this morning?
   今天早晨你真的感到身体不适吗？