trepidation
definition
a feeling of fear or agitation about something that may happen
example
She entered the examination room with a sense of trepidation, anxious about how well she would perform.
synonyms
apprehensionanxietyfear
word origin — from Latin 'trepidationem', meaning 'a trembling' or 'motion', derived from 'trepidare', which means 'to tremble'.