Meaning of the Sanskrit Word: tasthusah

  tasthuṣaḥ—not moving    SB 4.23.1-3
  tasthuṣaḥ—of nonmoving things    SB 6.3.12
  tasthuṣaḥ—of the being that is dull or stationed in one place    SB 7.3.29

Can't find any compound Sanskrit words containing tasthusah.