Ill (ĭl), adjective [The regular comparative and superlative are wanting, their places being supplied by worse and 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.

Neither is it ill air only that maketh an ill seat, but ill ways, ill markets, and ill neighbors. Bacon.

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 a fever.

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.

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.

Ill, noun

1. Whatever annoys or impairs happiness, or prevents success; evil of any kind; misfortune; calamity; disease; pain; as, the ills of humanity.

Who can all sense of others' ills escape
Is but a brute at best in human shape. Tate.

That makes us rather bear those ills we have
Than fly to others that we know not of. Shak.

2. Whatever is contrary to good, in a moral sense; wickedness; depravity; iniquity; wrong; evil.

Strong virtue, like strong nature, struggles still,
Exerts itself, and then throws off the ill. Dryden.

Ill, adverb In a ill manner; badly; weakly.
How ill this taper burns! Shak.

Ill fares the land, to hastening ills a prey, Where wealth accumulates and men decay. Goldsmith.

☞ Ill, like above, well, and so, is used before many participal adjectives, in its usual adverbal sense. When the two words are used as an epithet preceding the noun qualified they are commonly hyphened; in other cases they are written separatively;

as, an ill-educated man; he was ill educated; an ill-formed plan; the plan, however ill formed, was acceptable. Ao, also, the following: ill-affected or ill affected, ill-arranged or ill arranged, ill-assorted or ill assorted, ill-boding or ill boding, ill-bred or ill bred, ill-conditioned, ill-conducted, ill-considered, ill-devised, ill-disposed, ill-doing, ill-fairing, ill-fated, ill-favored, ill-featured, ill-formed, ill-gotten, ill-imagined, ill-judged, ill-looking, ill-mannered, ill-matched, ill-meaning, ill-minded, ill-natured, ill-omened, ill-proportioned, ill-provided, ill-required, ill-sorted, ill-starred, ill-tempered, ill-timed, ill-trained, ill-used, and the like.

-- Websters 1913