Knowing what actions are morally defensible is referred to as "moral judgment".
Moral judgments are assessments or suppositions shaped with reference to whether some activity or inaction, expectation, thought process, character characteristic, or a man overall seems to be (pretty much) Good or Bad as estimated against some standard of Good. The moral judgments of activities (or inaction) are typically the essential focal point of any exchange of Moral Judgments specifically, and Ethical investigation generally.