1.   A sardonic smile touched his lips.

2.   He almost flinched and then a sardonic smile twisted his lips.

3.   He gave a sardonic smile.

4.   Mawiir thinks for a minute, his scowl yielding to a sardonic smile.

5.   Asked if Muslims could return, he shrugged, with a sardonic smile.

6.   Costello shot him a sardonic smile.