spunk·y (sp?ng?k?)adj. spunk·i·er, spunk·i·est Informal Spirited; plucky.spunk?i·ly adv.spunk?i·ness n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.spunk?y (?sp?? ki) adj. spunk?i?er, spunk?i?est. plucky; spirited. [1780?90] spunk?i?ly, adv. spunk?i?ness, n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.