WordNet sense 1 (not reacting chemically):

unreactive

WordNet sense 2 (not involved in military operations):

nonoperational

WordNet sense 3 (not in physical motion):

motionless, static, still

WordNet sense 4 (not in motion):

nonmoving, unmoving

WordNet sense 5 (not active or activated):

quiescent

WordNet sense 6 (lacking in energy or will):

passive

WordNet sense 7 (not presently active):

latent

WordNet sense 8 ((of tumors e.g) slow to heal or develop and usually painless):

indolent

WordNet sense 9 (not in active use):

idle, unused

WordNet sense 10 ((of business) not active or brisk):

dull, slow, sluggish

WordNet sense 11 (requiring sitting or little activity):

sedentary

WordNet sense 12 (slow and apathetic):

inert, torpid

WordNet sense 13 (inactive but capable of becoming active):

dormant