WordNet sense 1 (a crackling or hissing noise cause by electrical interference):

atmospherics, atmospheric static

WordNet sense 2 (concerned with or producing or caused by static electricity):

electrostatic

WordNet sense 3 (not in physical motion):

inactive, motionless, still

WordNet sense 4 (not in motion):

nonmoving

WordNet sense 5 (not active or moving):

unchanging

WordNet sense 6 (characterized by an absence of force or forcefulness):

adynamic, undynamic

WordNet sense 7 (showing little if any change):

stable

WordNet sense 8 (not changeable or subject to change):

unchangeable