naysayer
nay·sayer
noun
1.
someone with an aggressively negative attitude
Origin
From nay + say + -er, equivalent to naysay + -er. First use appears c. 1552.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.