1.
taking heed; giving close and thoughtful attention
heedful of the warnings
so heedful a writer
heedful of what they were doing
2.
cautiously attentive
heedful of his father's advice
3.
giving attention
The following are synonyms for 'heedful'. Click on any of them to get both Bibliodata's full list of common definitions and a further set of synonyms.