pendular

/ˈpɛndʒələr/
adjective
  1. Relating to or resembling the motion of a pendulum; swinging back and forth.
    • The pendular movement of the old clock's weight kept perfect time.
    • Her arm made a pendular motion as she swung the lantern.
    • Engineers studied the pendular sway of the bridge during high winds.
Antonyms