Possible Clues:

• The glass is always half-empty for this person
• One expecting the worst
• Retired teacher is in bad mood, one anticipating the worst
• On rising girl is consumed by sulkiness. She doesn't think in a positive way
• Nuisance embracing single girl upset killjoy
• One expects the worst
• One sees the glass as always being half-empty
• I avoid returning during deadly epidemic — it’s not good for me
• Gloomy sort, retired teacher is in mood
• There's no hope for one of the spies that gets befogged