A person who practices or advocates skepticism, particularly with regard to the possibility of certainty in knowledge.

संदेहवादी

English Usage: The philosopher was considered pyrrhonian, always questioning the validity of established truths.

Hindi Usage: दार्शनिक को संदेहवादी माना जाता था, हमेशा स्थापित तथ्यों की वैधता पर सवाल उठाते हुए।