The phrase "sin of omission" refers to actions someone fails to take, rather than things they actively do. Synonyms for the phrase include neglect, disregard, oversight, lapsus calami, failure, and mistake. Each of these terms describes different nuances of this concept, from simple forgetfulness to intentional neglect or indifference. The expression is often used in moral or ethical discussions, where individuals are held to a certain standard of behavior or responsibility. Sin of omission suggests that there may be moral dimensions to actions that are passive or unassertive, and that neglecting opportunities to act can have consequences just as severe as more active misdeeds.