The most consistent sign of mental retardation is failure to adapt to social situations.

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Mental retardation, now referred to as intellectual disability, is diagnosed using standardized assessments of cognitive skills and adaptive functioning, not just social skills. While difficulties with social skills and adapting to social situations can be a part of intellectual disability, it is not the most consistent sign or the sole defining characteristic.

The Most Consistent Sign of Mental Retardation Is Failure to Adapt