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tr.v. nay·said (-sĕd′), nay·say·ing, nay·says (-sĕz′)
To oppose, deny, or take a pessimistic or negative view of: They will naysay any policy that raises taxes.

nay′say′er 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.


a refusal or denial
vb (intr)
1. to speak of something in a negative manner
2. to say no
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
Asked how he deals with the unavoidable negativity, particularly in social media, Darren said: 'Naysayers will always naysay, bashers will always bash, haters will always hate until they get what they want; till you say what they want to hear from you.
Go for what you want, work at it, achieve your goal and let no one naysay it to you.
There is no need for a detailed list, but it is obvious that they can ask him to naysay things behind closed doors.
"When people naysay the panel's report and say 'We knew all this' or 'Why did we need a panel, just give us the documents' I wonder what they think we engaged in over the last two years.