Frenchness
Concise Oxford English Dictionary © 2008 Oxford University Press:
French/frentʃ/
▶adjective relating to France or its people or language. ▶noun the language of France, also used in parts of Belgium, Switzerland, Canada, and certain other countries.
– phrases
(if you'll) excuse (or pardon) my French informal used to apologize for swearing.
(if you'll) excuse (or pardon) my French informal used to apologize for swearing.
– derivatives
Frenchness noun.
Frenchness noun.
'Frenchness' also found in these Oxford entries:

