carefulness

noun

1. Careful forethought to avoid harm or risk: calculation, care, caution, chariness, gingerliness, precaution, wariness. See fear/courage.
2. Attentiveness to detail: care, fastidiousness, meticulousness, pain (used in plural), painstaking, punctiliousness, scrupulousness, thoroughness. See careful/careless.
3. Cautious attentiveness: care, caution, gingerliness, heed, heedfulness, mindfulness, regard. See careful/careless.

The noun has 2 meanings:

Meaning #1: the trait of being cautious; being attentive to possible danger
  Synonyms: caution, cautiousness

Meaning #2: the quality of being careful and painstaking
  Antonym: carelessness (meaning #1)