I. -vənt adjective
Date: 1602
1.
a. : paying strict attention : watchful
an observant spectator
b. : keen , perceptive
2. : careful in observing (as rites, laws, or customs) : mindful
pious and religiously observant families — Sidney Hook
always observant of the amenities
• ob·ser·vant·ly adverb
II. noun
Date: 1605
obsolete : an assiduous or obsequious servant or attendant