Possible Clues:

• Resentfully
• In a resentful manner
• With resentment
• Second class collects litter from yard in a resentful manner
• Sounds like it's a bit early to be worse with a cold
• How one might resent beer?
• How hot-button issues are contested
• Sharply, pungently
• Acrimoniously
• Resentfully, rancorously