Phonetic: /trep·​i·​da·​tion/

Part of Speech: Noun

Definition

a nervous or fearful feeling of uncertain agitation : apprehension
trepidation about starting a new job

Travers sent the book to press with some trepidation, fearing that a children’s book might undermine her hard-won literary cachet.
—Caitlin Flanagan

a tremulous motion : tremor