Inobservance refers to the lack of attention or heed given to something. Some synonyms for this word include disregard, neglect, noncompliance, dereliction, indifference, and laxity. Disregard suggests intentionally ignoring something while neglect and noncompliance imply a failure to give proper attention or follow through with a duty or obligation. Dereliction implies a serious neglect of responsibility while indifference suggests a lack of interest. Laxity implies a lack of strictness or discipline in adhering to a rule or standard. Using synonyms of inobservance can help provide various ways to express a lack of attention or adherence to something.