1. 诽谤的：calumniator 诽谤者 | calumniatory 诽谤的 | calumnious 毁谤的

2. 诽谤的/中伤的：calumniator /中伤者/诽谤者/ | calumniatory /诽谤的/中伤的/ | calumnious /毁谤的/中伤的/

adj

1. (used of statements) harmful and often untrue
    tending to discredit or malign

    Synonym: calumniousdefamatorydenigrativedenigratingdenigratorylibellouslibelousslanderous