Afraid/əˈfreɪd/ Definition 1 of 3Pro Tip 1/3Expressing Fear Directly communicates personal fears or concerns about specific things or situations. I'm afraid of heights, so I avoid tall buildings. Pro Tip 2/3Not Always Rational Fears can be irrational; 'afraid' doesn't necessarily imply the fear is logical. I'm afraid of the dark even though I know it's safe. Pro Tip 3/3Fear of Actions 'Afraid' can also refer to the fear of doing something, not just of something existing. She's afraid to speak in public.