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;
      disagreeable; unfavorable.
      1913 webster

            neither is it ill air only that maketh an ill seat,
            but ill ways, ill markets, and ill neighbors.
                                                  --bacon.
      1913 webster

            there 's some ill planet reigns.      --shak.
      1913 webster

   2. contrary to good, in a moral sense; evil; wicked; wrong;
      iniquitious; naughtly; bad; improper.
      1913 webster

            of his own body he was ill, and gave
            the clergy ill example.               --shak.
      1913 webster

   3. sick; indisposed; unwell; diseased; disordered; as, ill of
      a fever.
      1913 webster

            i am in health, i breathe, and see thee ill. --shak.
      1913 webster

   4. not according with rule, fitness, or propriety; incorrect;
      rude; unpolished; inelegant.
      1913 webster

            that 's an ill phrase.                --shak.
      1913 webster

   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.

   ill turn.
      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.
        1913 webster
see also:
ill at ease ill blood ill breeding ill fame ill humor ill nature 
ill temper ill turn ill will