Final answer:
The weakness of using "deviation from mental health" to define abnormality is its lack of clear criteria and subjective nature, reflecting the cultural and historical variability in the understanding of mental health.
Step-by-step explanation:
One more weakness of "deviation from mental health" as a definition of abnormality is that it lacks clear criteria and is subjective. This weakness means that determining what constitutes mental health can vary greatly between different professionals and cultural contexts, as there is no universal standard for what is considered 'normal' functioning. This subjectivity reflects the cultural concepts of distress (CCD), which acknowledge the influence of cultural groups on the understanding and expression of mental illness. Similarly, historical perspectives on mental health demonstrate how perceptions of deviance, such as those surrounding homosexuality or gender nonconformity, can shift over time, further emphasizing the non-universal nature of mental health definitions.