Source : Webster's Revised Unabridged Dictionary (1913)

Heedful \Heed"ful\, a.
   Full of heed; regarding with care; cautious; circumspect;
   attentive; vigilant. --Shak. -- {Heed"ful*ly}, adv. --
   {Heed"ful*ness}, n.

Source : WordNet®

heedfulness
     n : the trait of staying aware of (paying close attention to)
         your responsibilities [syn: {mindfulness}] [ant: {unmindfulness},
          {unmindfulness}]