skeptic
//ˈskɛptɪk//
Noun
skepticSingular
skepticsPlural
1
A person inclined to question or doubt accepted opinions or claims.
As a skeptic, she always asks for evidence before believing any claim.
2
A person who doubts the truth of a particular religion or religious beliefs.
He was raised in a religious family but became a skeptic as an adult.
3
In philosophy, a person who holds that true knowledge or certainty is impossible.
Ancient Greek skeptics argued that absolute knowledge is unattainable.