rogue

A scoundrel, rascal or unprincipled, deceitful, and unreliable person.

A mischievous scamp.

A vagrant.

Deceitful software pretending to be anti-spyware, but in fact being malicious software itself.

An aggressive animal separate from the herd, especially an elephant.

A plant that shows some undesirable variation.

A character class focusing on stealthy conduct.