A sense of the absurd married to an inflexible observation of the rules of etiquette

She [Countess Bianca Maria Colomba Korvin] came to personify for me more and more all the qualities of the Habsburg world: perseverance, courage, detachment, and, perhaps above all, a sense of the absurd married to an inflexible observation of the rules of etiquette. However much we laughed together and became friends, the formal Sie was never once surrendered to the informal Du.

R. Bassett, Last days in old Europe (2019), 14-15