Real Dictionary

nice
If you are nice to people, you are friendly, pleasant, or polite towards them.
adjective: If you say that it is nice of someone to say or do something, you are saying that they are being kind and thoughtful. This is often used as a way of thanking someone.
adjective: If you say that someone is nice, you mean that you like them because they are friendly and pleasant.
adjective: If you say that something is nice, you mean that you find it attractive, pleasant, or enjoyable.

Nice in American English
difficult to please; fastidious; refined
seaport & resort in SE France: pop. 342,000
adjective: pleasing; agreeable; delightful

nice in British English
adjective: pleasant or commendable
noun: a city in SE France, on the Mediterranean: a leading resort of the French Riviera; founded by Phocaeans from Marseille in about the 3rd century bc. Pop: 348 721 (2007)
noun acronym for: (in England and Wales) National Institute for Health and Care Excellence: a body that provides guidance on best practice in medicine and treatments in the NHS