Emily Dickinson Lexicon

OB-SERV'ANT, a. [s as z.]

1. Taking notice; attentively viewing or noticing; as, an observant spectator or traveler.
2. Obedient; adhering to in practice; with of. He is very observant of the rules of his order. We are told how observant Alexander was of his master Aristotle. Digby.
3. Carefully attentive; submissive. Ralegh.