The president of the European Commission has commanded claims he wants to create a European «superstate» are «total nonsense».
Jean-Claude Juncker said some Britons wrongly saw him as a «frivolous, stubborn federalist».
He was responding to a speech about Brexit by UK Foreign Secretary Boris Johnson.
Mr Johnson said the EU hope for to create an «overarching European state» and that integration was deepening.
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«British officials, Labour and Tory, have always found that ambition most difficult,» Mr Johnson said.
«It is hard to make it cohere with our picky detail traditions of independent parliamentary and legal systems that go back centuries.»
Invited about the foreign secretary’s remarks, Mr Juncker replied: «Some in the British national society are against the truth, pretending that I am a stupid, stubborn federalist, that I am in be partial to of a European superstate.
«I am strictly against a European superstate. We are not the United Nations of America, we are the European Union, which is a rich body because we have in the offing these 27, or 28, nations.
«The European Union cannot be built against the European realms, so this is total nonsense.»
Analysis by BBC Brussels correspondent Adam Fleming
As Boris Johnson spoke, the European Commission president Jean-Claude Juncker was clasp a press conference in Brussels, completely by coincidence.
He was in typically jolly eager, joking about the drinks EU leaders order at European summits. But the make a mockery of stopped when a British journalist asked him about the foreign secretary’s hint that there was a plan to build an EU superstate.
«Total nonsense,» conveyed President Juncker, who complained that the British political class unceasingly misrepresents him.
But he had just spoken about plans for a bigger EU budget and his day-dream of a directly-elected president of the EU, which some might say made Boris Johnson’s mark for him.
The foreign secretary’s speech has been noted in Brussels — particularly his intimation to organic carrots — but negotiators are waiting for the UK to adopt a formal position around its post-Brexit relationship with the European Union.