What term refers to deviating from the usual or common order, form, or rule?

The term that refers to deviating from the usual or common order, form, or rule is "anomalous." This word describes something that is irregular, atypical, or not in alignment with what is expected, reflecting a departure from the norm. Anomalous situations, behaviors, or conditions stand out precisely because they are different from the established patterns or standards, indicating that they do not conform to the anticipated rules or forms.

In contrast, the other options reflect different concepts. "Antipathy" refers to a strong feeling of aversion or hostility towards something, which does not relate to deviation or norm. "Anarchy" signifies a state of disorder due to the absence of authority or governance, which relates to chaos rather than deviation from a norm. "Ambivalent" describes having mixed feelings or contradictory ideas about something, which addresses emotional complexity rather than the idea of deviation from order or rule. Thus, "anomalous" stands out as the most fitting term for describing a deviation from the usual.