1 not doing anything; not active:
Some animals are inactive during the daytime. * The area has a large, but politically inactive population. * The volcano has been inactive for 50 years.
2 not in use; not working:
an inactive oil well
3 having no effect:
an inactive drug / disease
OPPACTIVE
inactivity noun [U]:
periods of enforced inactivity and boredom * The inactivity of the government was deplorable.
