naysayer Synonyms

doubter cynic pessimist rejecter wet blanket killjoy downer negativist detractor refuter worrier skeptic sceptic worrywart faultfinder cassandra biggest stick-in-the-mud big sourpuss worryguts sourpuss prophet of doom diehard contrarian bah humbug doomsayer angel's advocate defeatist refuser quibbler adversary dissident dissenter disputant denier croaker critic complainer arguer antagonist gloomy hater heretic protester oppositionist opposer obstructionist objector nonconformist nihilist misfit