Possible Clues:

• Have misgivings about light-weight
• A light-weight has reason to hesitate
• Not weighing very heavily on one's conscience?
• A few grains of doubt
• Moral doubt carrying little weight
• Qualm making us wait, say, for apothecary
• Weight (on one's conscience?)
• PC rules in order to obtain regard for morality
• Moral uncertainty
• Small moral doubt