Adverb

ganz und gar

completely, absolutely, utterly

Das ist ganz und gar falsch.

That is completely wrong.

Ich habe es ganz und gar vergessen.

I have completely forgotten it.

... is completely/absolutely ... Das ist ganz und gar falsch.

Synonyms: completely, totally, utterly; Antonyms: partially, partly

A doubling for emphasis, combining 'ganz' (whole, quite) and 'gar' (even, at all). It's a redundant construction that means 'wholly and utterly'.

Think of it as 'whole and entirely'. The repetition of two words meaning 'complete' makes the expression very strong.

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