Possible Clues:

• Doubter
• One unwilling to give credit
• Agnostic
• One inclined to doubt
• To go bad about a hundred in a disbelievable way
• One who doubts accepted opinions
• Doubtful individual
• Affected by bacteria, catching cold? One has doubts
• Doubter takes a lot of flak for pinching mushroom
• Moore's man from Missouri?