Here are some ways to describe a mean personality in English:
* Unkind: They are deliberately hurtful and lack compassion.
* Cruel: They take pleasure in inflicting pain or suffering on others.
* Spiteful: They act with malice and intent to harm.
* Vicious: They are aggressive and have a tendency to be violent.
* Nasty: They are unpleasant and rude in their behavior.
* Bully: They use their power to intimidate and harm others.
* Ruthless: They lack empathy and are willing to do whatever it takes to achieve their goals, even if it hurts others.
* Callous: They are indifferent to the suffering of others.
* Malicious: They have a desire to harm others.
* Aggressive: They are confrontational and often use threats or violence.
* Intimidating: They make others feel threatened or afraid.
* Abrasive: They are harsh and irritating in their interactions with others.
* Cold-hearted: They lack warmth and emotion.
* Heartless: They are insensitive to the feelings of others.
You can also use phrases like:
* They have a mean streak.
* They're always looking for a fight.
* They get a kick out of hurting people.
* They have no conscience.
Remember, it's important to be mindful of the language you use to describe someone's personality. Using strong negative terms can be hurtful and should be used responsibly.