Rogue
Part of speech: noun
Definition: 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.
Part of speech: adjective
Definition: Vicious and solitary. Large, destructive and unpredictable. Deceitful, unprincipled.
Part of speech: verb
Definition: cull, term used by gardeners, especially when saving seed, rogue or unwanted plants are removed before pollination.
Example sentence: When we think of the major threats to our national security, the first to come to mind are nuclear proliferation, rogue states and global terrorism. But another kind of threat lurks beyond our shores, one from nature, not humans - an avian flu pandemic.
Rapscallion
Part of speech: noun
Definition: A rascal, scamp, rogue or scoundrel.