Afraid (adjective)

1. Feeling fear or apprehension about a possible or likely situation or event.
2. Feeling fear or trepidation in anticipation of something.
3. Feeling fear or anxiety about something.
4. Hesitant or unwilling to do something because of fear or anxiety.
5. Timid or fearful.

Origin:

Middle english: from old english æfered, past participle of æfyrran "frighten away".

Examples:

1. I'm afraid of heights.
2. He is afraid of failure.
3. She is afraid of spiders.
4. I am afraid to go to the dentist.
5. He is afraid of making a mistake.