I'm afraid not
Unfortunately, no; I regret that that is not so.
Do you have any beer? No, I'm afraid not.
adj
Impressed with fear or apprehension; in fear.
He is afraid of death.
He is afraid to ask her out.
Regretful, sorry; expressing a reluctance to face an unpleasant situation.
I am afraid I cannot help you in this matter.
Worried about, feeling concern for, fearing for (someone or something).