unruffled
/ˌʌnˈrʌfld/adjective
1- not disordered or disarranged不起皱的, 平整的：
the unruffled waters of the lake.
风平浪静的湖面。
1.1
- (of a person) not agitated or disturbed; calm（人）非激动不安的; 泰然自若的。