What is an antonym for guardian?

There isn't one perfect antonym for "guardian" because it has multiple meanings and the opposite depends on the context. Here are some options depending on the specific meaning:

If "guardian" refers to someone who protects:

* Aggressor: This is a direct opposite, someone who attacks and causes harm.

* Threat: A person or thing that poses danger.

* Predator: Someone who seeks to harm or exploit.

* Abuser: Someone who mistreats or harms.

If "guardian" refers to someone who takes care of a child or property:

* Neglecter: Someone who fails to provide care.

* Abandoner: Someone who leaves someone without care.

* Exploiter: Someone who takes advantage of someone's vulnerability.

* Destructor: Someone who destroys or damages.

If "guardian" refers to a spirit or being that protects:

* Demon: An evil spirit or being.

* Destroyer: Something that brings ruin or destruction.

* Harbinger of Doom: A sign or omen of disaster.

The best antonym for "guardian" will depend on the specific context.