The term ‘Euroscepticism’ first appeared on 11 November 1985, in the British newspaper, The Times, to describe a sceptic opposition towards the European Union and its policies that would be more flexible than ‘euro-phobia’ or ‘anti-Europeanism’.
However, it wasn’t until British Prime Minister Margaret Thatcher’s famous “Bruges Speech” on 20 September 1988 that the word gained popularity. In the discourse given to the College of Europe in Brussels, the then Prime Minister was very vocal in her opposition to the European Union sovereignty to supersede that of Great Britain:
We have not successfully rolled back the frontiers of the state in Britain, only to see them reimposed at a European level, with a European superstate exercising a new dominance from Brussels.

Since then, Euroscepticism has continued to grow across Europe. You can find a A guide to information sources on Euroscepticism here.