Overapprehensive is a term used to describe someone who is excessively anxious or worried about something. Some synonyms for this word include overly anxious, excessively concerned, hyper-vigilant, and overly cautious. Other synonyms include hypervigilant, panicky, nervous, hesitant, apprehensive, and jumpy. These words describe a person who is constantly on edge and is afraid of what may happen next. Overapprehensive people tend to worry about the future and often have a difficult time relaxing and letting go. If you or someone you know displays these characteristics, it may be helpful to seek professional help to learn how to manage these feelings.