adjective
not used before a noun
[more ~; most ~] :feeling fear: such as
worried that something will cause pain or injury
nervous about doing something - often + of
nervous or worried that something might happen
used in the phrase I'm afraid as a polite way of showing that you are sorry about a disappointing, negative, or critical statement
used with not to say that someone is willing to do something; often + of
afraid for
feeling fear or worry about (something or someone)
US