Source : Webster's Revised Unabridged Dictionary (1913)

Prayerful \Prayer"ful\, a.
   Given to prayer; praying much or often; devotional. ``The
   prayerful man.'' --J. S. Blackie. -- {Prayer"ful*ly}, adv. --
   {Prayer"ful*ness}, n.

Source : WordNet®

prayerful
     adj : disposed to pray or appearing to pray