nerve·less (nûrv?l?s)adj.1. Lacking strength or energy; spiritless; weak.2. Lacking courage; cowardly.3. Calm and controlled in trying circumstances; cool.nerve?less·ly adv.nerve?less·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.nerveless (?n??vl?s) adj1. calm and collected2. listless or feeble ?nervelessly adv ?nervelessness nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014nerve?less (?n?rv l?s) adj. 1. without nervousness; calm. 2. lacking strength or vigor; weak. nerve?less?ness, n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.