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un‧well
[not before noun]
[not before noun] formal ill, especially for a short time :
She had been feeling unwell.
She had been feeling unwell. ➔ see usage note sick1WORD CHOICE: 
sick, throw up, vomit, ill, not well, unwellIn 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

sick, throw up, vomit, ill, not well, unwellIn 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
