[uncountable, countable] the feelings that you have in your body when you have been hurt or when you are ill

1[uncountable, countable] the feelings that you have in your body when you have been hurt or when you are sick a cry of pain She was clearly in a lot of pain.

1(formal) to cause someone pain or make them unhappy synonym hurt pain somebody She was deeply pained by the accusation.

​to cause somebody pain or make them unhappy synonym hurt. pain somebody She was deeply pained by the accusation. (old use) The wound still pained him ...

There are 18 meanings listed in OED's entry for the noun pain, four of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and quotation ...

pains ; be at pains to do something · to put a lot of effort into doing something correctly. She was at great pains to stress the advantages of the new system.

causing you physical pain. Painful can describe a part of the body, illness, injury, treatment or death.

causing you physical pain. Painful can describe a part of the body, an illness, an injury, a treatment, or a death.

to put a lot of effort into doing something The couple went to great pains to keep their plans secret. take (great) pains with/over something.

Causing or accompanied by emotional discomfort, as embarrassment, irritation, etc. Also in weakened sense: immoderate, excessive.