Antonym: heedless. Similar words: handful, mindful, dreadful, mindfully, regardful, heed, wheedle, heedless. Meaning: ['hɪːdfʊl] 
adj. 1. taking heed; giving close and thoughtful attention 2. cautiously attentive 3. giving attention.
adj. 1. taking heed; giving close and thoughtful attention 2. cautiously attentive 3. giving attention. 
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1. You should be more heedful of advice.
2. These adjectives mean mindful or heedful of something.
3. They cannot realize the horror of the heedful preparations.
4. Hence the enlightened ruler is heedful ,[Sentence dictionary] and the good general full of caution.
5. Being heedful means the teachers should become active learners with open mind.
6. If in doubt, we should be heedful of the maxim Primum non nocere: first, do no harm.
7. A stronger China is becoming less heedful of Deng's strategy of caution.
8. The heedful do not die; the heedless are like unto the dead.
9. And the military, despite its intermittently heavy-handed responses, is heedful of public sentiment to a degree unprecedented under the old regime.
10. There will come to be people who'll hurt you... so you need to continue trusting...just be heedful.
More similar words: handful, mindful, dreadful, mindfully, regardful, heed, wheedle, heedless, cheerful, cheerfully, cheerfulness, at full speed, red flag, unlooked-for, cold fusion, closed fracture, extended family, and function, thee, sheep, sheer, sheen, heel, ghee, sheet, sheers, cheer, cheep, heels, wheel.