adjective (a)

• (sometimes followed by `of') having or showing knowledge or understanding or realization or perception(adj.all)

  Example:
  Was aware of his opponent's hostility.
  Became aware of her surroundings.
  Aware that he had exceeded the speed limit.
  

  Synonym:
  cognisant, cognizant
  Antonym:
  incognizant, unaware
  

  source: wordnet30
• bearing in mind; attentive to(adj.all)

  Synonym:
  mindful
  Antonym:
  forgetful, mindless, unmindful
  

  source: wordnet30
• Watchful; vigilant or on one's guard against danger or difficulty.(adjective)

  source: webster1913