Final answer:
Deviant behavior is an act that is considered unusual, strange, or undesirable and can cause unhappiness for the individual. It is a violation of social norms and can be seen differently depending on the context, culture, or social setting.
Step-by-step explanation:
Behavior that is unusual, considered strange or undesirable, and a source of unhappiness for the individual, is termed deviant behavior. Deviance is a violation of contextual, cultural, or social norms. It is important to recognize that deviance can be relative, meaning behaviors may be considered deviant based on circumstances in which they occur rather than the behavior itself. Sociological concepts like the differential association theory explain that individuals learn deviant behavior from those close to them. In contrast, the labeling theory highlights the role of society in ascribing deviant labels to individuals. Deviance is not necessarily bad, as some behaviors that are considered deviant can contribute to positive social change.