Given to or marked by willful, often perverse deviation from what is desired, expected, or required in order to gratify one's own impulses or inclinations. See Synonyms at unruly.
Swayed or prompted by caprice; unpredictable.
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.