apprehension
/ˌæprɪˈhɛnʃən/
noun
plural -sions
fear that something bad or unpleasant is going to happen :a feeling of being worried about the future [noncount]
formal :the act of apprehending someone or something: such as
the act of arresting someone for a crime [noncount]
[noncount] somewhat old-fashioned :the act of noticing and understanding something