trep·i·da·tion 
/ˌtrɛpəˈdeɪʃən/ noun
/ˌtrɛpəˈdeɪʃən/ noun [noncount] formal : a feeling of fear that causes you to hesitate because you think something bad or unpleasant is going to happen
▪ He had/felt some trepidation about agreeing to their proposal.
▪ He had/felt some trepidation about agreeing to their proposal.
