fear the bad feeling that you have when you are in danger or when a particular thing frightens you: (a) fear of flying; She showed no fear. terror a feeling of ...

the bad feeling that you have when you are in danger, when something bad might happen, or when a particular thing frightens you Her eyes showed no fear.

[transitive] to be frightened of somebody/something or frightened of doing something. fear somebody/something All his employees fear him.

There are 17 meanings listed in OED's entry for the verb fear, seven of which are labelled obsolete. See 'Meaning & use' for definitions, usage, ...

1[transitive] to be frightened of someone or something, or frightened of doing something fear somebody/something All his employees fear him. to fear death/ ...

afraid [not before noun] feeling fear; worried that something bad might happen: There's nothing to be afraid of. Aren't you afraid (that) you'll fall?

an unpleasant emotion or thought that you have when you are frightened or worried by something dangerous, painful, or bad that is happening or might happen.

to be worried about someone or something. We fear for his safety. He feared for his mother, left alone on the farm.

​to be worried about somebody/something. We fear for his safety. They feared for their lives. He feared for his mother, left alone on the farm.

fearful · ​(formal) nervous and afraid. fearful (for somebody) Parents are ever fearful for their children. fearful (of something/of doing something) fearful of ...