I'm afraid › used to politely tell someone bad news or to politely disagree with someone: We haven't got any tickets left, I'm afraid. [+ (that)] I'm afraid that I've broken your vase.
FRIGHTENED › frightened: She's afraid of water.
WORRIED › worried that something bad might happen: [+ (that)] Many people are afraid that they might lose their jobs. [+ of + doing sth] He was afraid of upsetting Clare.