Definitions

1. noun

A person who questions the truth or validity of something, especially a scientific or philosophical theory.

“He was a sceptic about the new medical treatment, wanting to see more evidence before giving it a try.”

2. noun

A person who doubts the genuineness or sincerity of something or someone.

“The sceptic of the charity organisation was suspicious of the charity’s motives.”

3. adjective

Doubting the truth or validity of something.

“The sceptical approach to the new scientific theory was well-received by the academic community.”