doubting thomas is a noun meaning "the Apostle who would not believe the resurrection of Jesus until he saw Jesus with his own eyes". It carries 2 recorded senses.
the Apostle who would not believe the resurrection of Jesus until he saw Jesus with his own eyes
someone who demands physical evidence in order to be convinced (especially when this demand is out of place)
Definitions, synonyms and semantic relations for doubting thomas come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.