Etymology
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naysayer (n.)

"one who refuses or denies," 1721, from verb naysay (implied from 1530s in naysaying); from nay + say (v.). The verbal phrase say (someone) no "refuse, deny" is from c. 1300. Nay-say (n.) "refusal" is from 1630s.

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Definitions of naysayer

naysayer (n.)
someone with an aggressively negative attitude;
From wordnet.princeton.edu