doubting Thomas - definition and synonyms

noun [countable] 

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/ˌdaʊtɪŋ ˈtɒməs/
singulardoubting Thomas
pluraldoubting Thomases
  1. someone who will not believe something unless they see definite proof
Word story
In the Bible, the apostle Thomas did not believe that Jesus Christ had risen from the dead until he saw his wounds.