Longman Dictionary of Contemporary English homepage

unwell

adjective
     
un‧well [not before noun]
formal ill, especially for a short time:
She had been feeling unwell.
see usage note sick1WORD CHOICE: WORD CHOICE:

sick, throw up, vomit, ill, not well, unwell
In British English, sick is usually used in the expressions be sick (=have the food in your stomach come up through your mouth) and feel sick (=feel as if this is going to happen) Someone had been sick on the floor. Stop it, I feel sick!In American English, you say that someone throws up. Throw up is also used in British English but is fairly informal.Vomit is a fairly formal way to say 'throw up'. If someone has an illness or disease, you usually say that they are ill in British English, and sick in American English He missed a lot of school when he was ill (BrE)/sick (AmE). In American English, ill suggests you have a more serious disease, from which you may not recover.If someone is slightly ill, you often say in British English that they are not well I won't come out - I'm not very well.Unwell is a more formal word for 'ill' or 'sick'.See also sick

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