An unprincipled, deceitful, and unreliable person; a scoundrel or rascal.
One who is playfully mischievous; a scamp.
A wandering beggar; a vagrant.
A vicious and solitary animal, especially an elephant that has separated itself from its herd.
An organism, especially a plant, that shows an undesirable variation from a standard.
Vicious and solitary. Used of an animal, especially an elephant.
Large, destructive, and anomalous or unpredictable: rogue tornado.
Operating outside normal or desirable controls:"How could a single rogue trader bring down an otherwise profitable and well-regarded institution?" (Saul Hansell).