heedful in WordNet English dictionary

1. giving attention
   advertent  heedful 
   
2. taking heed; giving close and thoughtful attention
   "heedful of the warnings"; "so heedful a writer"; "heedful of what they were doing"
   heedful  attentive  thoughtful  paying attention 
   
3. cautiously attentive
   "careful of her feelings"; "heedful of his father's advice"
   careful  heedful