Call me a heretic, naysayer, non-believer, denier, etc.
来自SA
If a naysayer close to you has been difficult and critical, there's a good chance you've finally silenced that person.
如果你身边有和你唱反调和总给你制造麻烦的人存在，那么这个月有个很好的机会让这个人彻底闭嘴。
But the naysayer's objection was enough to stall the project an outcome that seemed to please her.
来自WSJ
I must report that Owen Paterson, Environment Secretary, is a bit of a naysayer.
来自THETIMES