Deviating from the proper or expected course.(adjective)
Deviating from what is normal; untrue to type.(adjective)
One that is aberrant.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "aberrant" in a sentence
"They rely on families to actually report what they call aberrant behavior."
"Felipe Calderon went on Twitter to express dismay over what he called an "aberrant act of terror and barbarity.""
"It also says some civilian supervisors are also at fault for ignoring clear signs of what it called his aberrant behavior."