Related Clues:

• Pessimist
• Intolerant sort
• Pessimistic type
• Misanthrope, e.g.
• Sour sort
• Intolerant person
• Intolerant type
• Glass-half-empty type
• Distrustful sort
• Biased one
• Doubter
• Suspicious sourpuss
• Skeptical sort
• Diogenes, for one
• Skeptical person