roguish

1. ADJ If someone has a roguish expression or manner, they look as though they are about to behave badly. (表情或言行)淘氣的; 擣蛋的

She was a mature lady with dyed red hair and a roguish grin. 她是位染著紅頭發和有張頑皮笑臉的成熟女士。