רָגַז râgaz (H7264)

to quiver (with any violent emotion, especially anger or fear)

1) tremble, quake, rage, quiver, be agitated, be excited, be perturbed 1a)(Qal) to quake, be disquieted, be excited, be perturbed 1b) (Hiphil) to cause to quake, disquiet, enrage, disturb 1c) (Hithpael) to excite oneself

a primitive root;