As verbs the difference between inactivate and deactivate
is that inactivate
is to make inactive while deactivate
is to make something inactive or no longer effective.
To make inactive.
"'Computer inactivated, Crawford reported. 'I get nothing at all.'" - Larry Niven and Jerry Pournelle, ''The Mote in God's Eye , 1974
(ergative) to make something inactive or no longer effective
to prevent the action of a biochemical agent (such as an enzyme)
to remove a person or piece of hardware from active military service