Sardonicism is when someone makes funny or mocking comments, but in a way that shows they are not happy.
Sardonicism can make people feel uncomfortable or like the person is not very nice.
Examples:
Her sardonicism made everyone feel strange.
I don't like his sardonicism.
The sardonicism in his voice made me feel bad.
His sardonicism is not very nice.
The sardonicism in her jokes made everyone feel weird.
The sardonicism in his smile made me feel strange.