There are multiple definitions - click on the translation that matches your context.

不足的行为能力

名词

full

diminished capacity

noun

Definitions of diminished capacity

a defence used by a person charged with a crime that they where in such a mental state at the time of the offence that they could not form the intent necessary to commit the crime they are charged with

Today's decision to abandon the settled defence of diminished capacity defies common sense and reason.

a mental state that does not allow a person to form the intent necessary to do a particular crime but which does not cause the person to be considered insane (=not responsible because of mental illness)

Defence counsel went on to say that his client suffers from a brain injury and has a diminished capacity.