insouciance

noun2

1. •
   Carelessness, heedlessness, indifference, or casual unconcern.

   • So Gelernter, with an insouciance he now regrets, also chose a Lovelace as a namesake—Linda, the lead actress in "Deep Throat." — 1995
2. •
   Nonchalance.

   • She almost felt insulted by [the wild boar's] insouciance as it rooted in her grove. — 2024