WordNet sense 1 (not active or moving):

static

WordNet sense 2 (characterized by an absence of force or forcefulness):

adynamic, undynamic

WordNet sense 3 ((sometimes followed by `with') in agreement or consistent or reliable):

consistent

WordNet sense 4 (showing little if any change):

stable

WordNet sense 5 (not changeable or subject to change):

unchangeable