Scruples!

Main Entry: scruple
Function: noun
Etymology: Middle English scrupul, from Middle French scrupule, from Latin scrupulus, diminutive of scrupus source of uneasiness, literally, sharp stone
1 : an ethical consideration or principle that inhibits action
2 : the quality or state of being scrupulous
3 : mental reservation
synonym see QUALM

* Merriam-Webster

For more scruples, watch Pride and Prejudice!