smirking
Definitions
Smiling in a smug, conceited, or silly way.
Smiling in a way that suggests suppressed malice or self-satisfaction.
Examples
He was smirking as he watched his opponent struggle with the difficult puzzle.
The student couldn't stop smirking after realizing he had successfully pulled off the prank.
Synonyms
grinning simpering sneering smirkingly leering smug self-satisfied