a person who habitually expresses negative or pessimistic views: Despite a general feeling that things were going well, a few naysayers tried to cast gloom.
nay·say (nā'sā') tr.v.
nay·said (-sěd'), nay·say·ing, nay·says (-sěz') To oppose, deny, or take a pessimistic or negative view of: They will naysay any policy that raises taxes. nay'say'er n.