Definition of "je ne sais quoi" [je ne sais quoi]

• A quality or attribute that is difficult to describe or express: "Fishing has lacked a certain je ne sais quoi in terms of its public image, as all activities must that involve beer, worms and one-size-fits-all gimme caps” ( Charles Leerhsen). (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.