Understanding the Definition: One Who Doubts

The question asks us to find a single word that accurately describes a person who doubts. We need to look at the given options and see which one best fits this definition.

Let's examine each option:

• Doubtful: This word describes a state of being full of doubt, or something that causes doubt. It's an adjective, not a noun referring to a person. So, it doesn't fit "One who doubts".
• Debater: A debater is a person who argues for or against a topic in a structured discussion. While a debater might question points, the primary role is argumentation, not necessarily general doubt or skepticism.
• Sceptic: A sceptic (or skeptic) is a person who is inclined to question or doubt generally accepted opinions. They often require strong evidence before accepting something as true. This definition closely matches "One who doubts".
• Pessimist: A pessimist is a person who tends to see the worst aspect of things or believes that the worst will happen. While a pessimist might also doubt positive outcomes, their defining characteristic is their negative outlook, not a general inclination to doubt everything.

Identifying the Correct Word for 'One Who Doubts'

Comparing the options with the definition, the word that specifically means "One who doubts" or questions accepted ideas is 'Sceptic'.