Final answer:
The weakness of the failure to function adequately definition of abnormality lies in its subjective nature and lack of clear criteria. Additionally, it does not adequately consider the cultural context which may influence how symptoms are expressed and understood.
Step-by-step explanation:
The definition of abnormality based on failure to function adequately has certain weaknesses, two of which are particularly notable. Firstly, the criteria for what constitutes adequate functioning are subjective and lack clarity. What may be considered a failure to cope in one culture or society might be seen as adequate or even admirable in another. This subjectivity can make it difficult to consistently diagnose and support individuals with mental health issues. Secondly, the concept does not take cultural context into account sufficiently. The cultural concepts of distress (CCD), as defined by the DSM-5, point out that different cultures experience and express symptoms of mental illness in various ways. Thus, by not considering an individual's cultural background, the definition may pathologize behaviors that are normal within a certain cultural context and overlook others that may signify distress in the cultural framework.