noun
skeptic
SKEP-tik/ˈskeptɪk/
A person inclined to doubt or question claims.
The skeptic examines the supposedly lucky charm without accepting the seller's claims.

Etymology
Greek skeptikos meant “inquiring, reflective” and named a philosophical school that doubted the possibility of real knowledge. The name broadened to anyone who doubts claims or suspends judgment.
In context
Henry Drummond is a doubter Henry Drummond is a skeptic but his faith in humankind and his hope for a better future always remains intact
More examples
- Even the skeptics find the new study convincing.
- I'm a skeptic when it comes to miracle cures.
- The proposal's biggest skeptic asks how we will cover the cost.
Forms
skeptic · skeptics
skeptical adjective — Inclined to question claims or conclusions.
skepticism noun — An attitude of questioning or doubt.
Similar words
- doubter
- Often questions a particular claim rather than claims in general.
- disbeliever
- Rejects a claim rather than merely questioning its truth.