trepidant

/ˈtrɛpɪdənt/
adjective
  1. Trembling or quivering with fear or agitation; nervous and uncertain.
    • The trepidant rabbit froze at the sound of footsteps in the grass.
    • The trepidant leaves rustled in the wind, as if the tree itself was afraid.
    • His trepidant voice revealed how scared he was to speak in front of the crowd.
Antonyms