(ש"ע) פחד, מתח

n. tremulous agitation or fear; trembling movement

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Noun
1. a feeling of alarm or dread
(hypernym) apprehension, apprehensiveness, dread

nf. vibration, shudder, tremor

(n.)
Hence, a state of terror or alarm; fear; confusion; fright; as, the men were in great trepidation.
  

(n.)
An involuntary trembling, sometimes an effect of paralysis, but usually caused by terror or fear; quaking; quivering.
  

(n.)
A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars.