A painful emotion or passion excited by the expectation of evil, or the apprehension of impending danger; apprehension; anxiety; solicitude; alarm; dread.(noun)
source: webster1913
verb (v)
be afraid or feel anxious or apprehensive about a possible or probable situation or event(verb.emotion)
Example: I fear she might get aggressive.
source: wordnet30
be afraid or scared of; be frightened of(verb.emotion)
Example: I fear the winters in Moscow.
We should not fear the Communists!.