ill effect

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Also see: effect

Multiple Entries:
  ill    I'll    Ill.  

Concise Oxford English Dictionary © 2008 Oxford University Press:
ill/ɪl/

▶adjective

• 1 not in full health; unwell.

• 2 poor in quality.

  ■ harmful or hostile: ill feeling.

  ■ unfavourable.

▶adverb

• 1 badly, wrongly, or imperfectly: ill-chosen.

  ■ unfavourably.

• 2 only with difficulty: she could ill afford the cost of new curtains.

▶noun a problem or misfortune.

■ evil or harm.

– phrases
ill at ease uncomfortable or embarrassed.
speak (or think) ill of say (or think) something critical about.

– origin ME: from ON illr ‘evil, difficult’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
I'll/ʌɪl/

▶contraction I shall; I will.

Concise Oxford English Dictionary © 2008 Oxford University Press:
Ill.

▶abbreviation Illinois.