heedfulness

noun

1. Concentration of the mental powers on something: attention, attentiveness, concentration, consideration, regardfulness. See excite/bore/interest.
2. Cautious attentiveness: care, carefulness, caution, gingerliness, heed, mindfulness, regard. See careful/careless.

The noun has one meaning:

Meaning #1: the trait of staying aware of (paying close attention to) your responsibilities
  Synonym: mindfulness
  Antonym: heedlessness (meaning #3)