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as an explanation of the painting, sprezzatura means discontinuity, active violence, rapid and intransitive violence.
la sprezzatura servira de prétexte pour expliquer la peinture : «la sprezzatura est discontinuité, violence active, violence rapide, intransitive.
in order to pull glamour off, you need this renaissance quality of sprezzatura, which is a term coined by castiglione in his book, "the book of the courtier."
pour atteindre le glamour, il faut cette qualité de la renaissance, la “sprezzature”, un terme forgé par castiglione dans son livre “le livre du courtisan”.
in word or deed the courtier should "avoid affectation ... (and) ... practice ... a certain "sprezzatura" ... conceal all art and make whatever is done or said appear to be without effort and almost without any thought about it".
* polymathe est un personnage de la pièce "le faux savant" (1728) de du vaure.