disinvoltura
/ˌdɪsɪnvɒlˈtjʊərə/noun
mass noun
- self-assurance; lack of constraint自信; 无拘无束：
a certain disinvoltura was all very well, but not as unthinkingly as this!
有一定的自信是很好的, 但不是像这样没头没脑的。
词源
mid 19th cent.: from Italian， from disinvolto 'unembarrassed'， from disinvolgere 'unwind'.