There so many phrases that has the least formal diction. For instance the phrase kick back has an informal diction which makes is least formal type of diction.
To kick back
Formal Diciton
casual
A prepositional phrase.
"At least" is a prepositional phrase.
It depends--if your writing is not-so-formal, go ahead and use the phrase "France's..."If your writing is more formal than not-so-formal, use the phrase "...of France," unless your writing is riddled with too many prepositions already.
Et vous? [formal]Et toi? [informal]
"Thank you for your attention" could be a suitable alternative phrase to use in professional or formal communication.
Yes, it is quite acceptable. Why just the other day I was writing a GN&C paper for my publication in the AIAA and I used it at least six times.
Formal (suit and tie) or at least semi-formal (dress shirt).
The phrase 'suits me' is a colloquial phrase. It is a casual statement that the person is in agreement with something. It is not the sort of phrase that should appear in a CV or resume or anything that is written in formal English.
The least formal connotation refers to a communication style or tone that is casual, relaxed, and informal. It lacks strict adherence to formal rules and conventions, and often includes colloquial language and informal expressions.