doubting Thomas

Doubting Thomas - a person who is skeptical and refuses to believe something without proof.

Example - "I was a real doubting Thomas. I didn't believe the stuff would work"

Image - https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge0cBbWi7eJJEWsQ5YgLMpTBrPyYGrkwljt3I0A1wbXx7ZD7vwlhmGB87Rr7BDglZM-uOwwq4FaVYvT2s5sjJUXfHAyAM0VvjtTqMXwWm4RDl5TP2OYU6zyZTQyiF09V71A3_x1lK2kesW/s640/Doubting+Thomas+cartoon.jpg