Impressed with fear or apprehension; in fear; apprehensive.(preposition)
source: webster1913
adjective satellite (s)
filled with regret or concern; used often to soften an unpleasant statement(adj.all)
Example: I'm afraid I won't be able to come.
He was afraid he would have to let her go.
I'm afraid you're wrong.
source: wordnet30
feeling worry or concern or insecurity(adj.all)
Example: She was afraid that I might be embarrassed.
Terribly afraid of offending someone.
I am afraid we have witnessed only the first phase of the conflict.
source: wordnet30
having feelings of aversion or unwillingness(adj.all)
Example: Afraid of hard work.
Afraid to show emotion.