1. skeptic, sceptic, doubter — (someone who habitually doubts accepted beliefs)
… so in reality we are not truly ‘eurosceptic’ as we do not ‘doubt’ the harmful nature of the EU, but rather we regard that as axiomatic. What is more, we have nothing against Europe per se, it is the regulatory statist political entity called the European Union we abominate. Hell, I used to work for the EU which probably explains why I dislike it so much: I know how it really works.
Scepticism seems to imply ‘doubt’. We have no doubt whatsoever.