The Collaborative International Dictionary of English v.0.48:
Ill \Ill\ ([i^]l), a. [The regular comparative and superlative
are wanting, their places being supplied by worseand worst,
from another root.] [OE. ill, ille, Icel. illr; akin to Sw.
illa, adv., Dan. ilde, adv.]
1. Contrary to good, in a physical sense; contrary or opposed
to advantage, happiness, etc.; bad; evil; unfortunate;
Neither is it ill air only that maketh an ill seat,
but ill ways, ill markets, and ill neighbors.
There 's some ill planet reigns. --Shak.
2. Contrary to good, in a moral sense; evil; wicked; wrong;
iniquitious; naughtly; bad; improper.
Of his own body he was ill, and gave
The clergy ill example. --Shak.
3. Sick; indisposed; unwell; diseased; disordered; as, ill of
I am in health, I breathe, and see thee ill. --Shak.
4. Not according with rule, fitness, or propriety; incorrect;
rude; unpolished; inelegant.
That 's an ill phrase. --Shak.
Ill at ease, uneasy; uncomfortable; anxious. "I am very ill
at ease." --Shak.
Ill blood, enmity; resentment; bad blood.
Ill breeding, lack of good breeding; rudeness.
Ill fame, ill or bad repute; as, a house of ill fame, a
house where lewd persons meet for illicit intercourse.
Ill humor, a disagreeable mood; bad temper.
Ill nature, bad disposition or temperament; sullenness;
esp., a disposition to cause unhappiness to others.
Ill temper, anger; moroseness; crossness.
(a) An unkind act.
(b) A slight attack of illness. [Colloq. U.S.] -- Ill
will, unkindness; enmity; malevolence.
Syn: Bad; evil; wrong; wicked; sick; unwell.