Source : Webster's Revised Unabridged Dictionary (1913)

Distressful \Dis*tress"ful\, a.
   Full of distress; causing, indicating, or attended with,
   distress; as, a distressful situation. ``Some distressful
   stroke.'' --Shak. ``Distressful cries.'' --Pope. --
   {Dis*tress"ful*ly}, adv.

Source : WordNet®

distressfully
     adv : with distress; "`Doctor Rother says it's his only chance,'
           she added distressfully"