to fear; to be afraid/fearful/nervous of somebody/something
He thinks he may be flattened by a safe, and I'm afraid of paint spilling on me!
She said it on purpose to frighten him
There's nothing to be afraid of
Do you think you scare me?
He spoke more quietly lest he (should) be overheard/for fear of being overheard
-phobia
Traumatophobia/hydrophobia/gynophobia/satanophobia/hypnophobia