To reduce something’s or someone’s capability to do something.
“Calcium bursts would increase spermatozoa motility, where cholesterol would decapacitate spermatozoa, so preventing untimely activation.”
to make incapable (of doing something)
“The police officer was incapacitated by a blow to the head.”
prevent from functioning in a normal way
“he was incapacitated by a heart attack”
deprive (someone) of their legal capacity.