fear

noun:an unpleasant emotion caused by the belief that someone or something is dangerous, likely to cause pain, or a threat
- Her fear of heights prevented her from going on the roller coaster.
verb:to be afraid of (someone or something) as likely to be dangerous, painful, or threatening
- Many people fear public speaking more than they fear physical danger.
noun:a feeling of anxiety concerning the outcome of something or the safety of someone
- There are fears that the company may have to lay off staff.
verb:to be concerned that a particular undesirable outcome may occur
- I fear that the meeting will be postponed again.