ill

1. (often pluralized) Trouble; distress; misfortune; adversity.

   Music won't solve all the world's ills, but it can make them easier to bear.

2. Harm or injury.

   I wouldn't want you to do me ill.

3. Evil; moral wrongfulness.
4. A physical ailment; an illness.

   I am incapacitated by rheumatism and other ills.

5. PCP, phencyclidine.

1. Evil; wicked (of people).
2. Morally reprehensible (of behaviour etc.); blameworthy.
3. Indicative of unkind or malevolent intentions; harsh, cruel.

   He suffered from ill treatment.

4. Unpropitious, unkind, faulty, not up to reasonable standard.

   ill manners; ill will

5. Unwell in terms of health or physical condition; sick.

   I've been ill with the flu for the past few days.

6. Having an urge to vomit.

   Seeing those pictures made me ill.

7. (hip-hop slang) Sublime, with the connotation of being so in a singularly creative way.
8. Extremely bad (bad enough to make one ill). Generally used indirectly with to be.

   That band was ill.

9. Unwise; not a good idea.

adverb

Not well; imperfectly, badly; hardly.