Noun
sprezzatura (usually uncountable, plural sprezzaturas)
(chiefly art, music) The art of performing a difficult task so gracefully that it looks effortless; calculated nonchalance.
Only in recent history has "working hard” signaled pride rather than shame for lack of talent, finesse and, mostly, sprezzatura. Nassim Nicholas Taleb
Castiglione states that had he followed Tuscan usage in his book, his description of sprezzatura would appear hypocritical, in that his effort would be seen without a sense of nonchalance (Courtier 71). Source: Internet
The Count advocates the courtier engage in sprezzatura, or this “certain nonchalance”, in all the activities he participates in, especially speech. Source: Internet