aspersion

As a verb calumniate

is to make hurtful untrue comments about.

an attack on somebody's reputation or good name, often in the phrase to cast aspersions upon… .

Caluminate has no English definition.

an attack on somebody's reputation or good name, often in the phrase to cast aspersions upon….

is an attack on somebody's reputation or good name, often in the phrase to cast aspersions upon….

to make dirty; to soil.