Chesterfieldian

For example, in the chapter on “The Imperial Family," by Baron Sannomiya, this consummate Chesterfieldian, who acts as the court chamberlain, tells us what went on—outside of the imperial family.

Source: wiktionary

What most evidently prevailed, absit invidia, and what betrayed her into all the Chesterfieldian indecorums of laughter, was his addressing her in Irish.

Source: wiktionary

Lady Anne was very angry, both at herself and the Count; nevertheless, his perfect simplicity and sincerity, and the nonchalance with which he spoke, amused her as much as it vexed her; and, as poor Georgiana, after various efforts to subdue her risibility, was constrained to laugh outright, the features of Lady Anne admitted the Chesterfieldian smile, and she exclaimed, "Really, Count, you are the drollest man in the world, and say the oddest things in the world."

Source: wiktionary

Casting my fortunes at Mrs. Thompson's, I soon became initiated into the etiquette and usage of that polite caravansary; and I now write of that era of two-pronged forks, and when “saveall” was the choicest dish, and the observances at the table not altogether Chesterfieldian.

Source: wiktionary