observant observant /əbˈzɝːvənt/

adjective

1. () Paying close attention especially to details  ( observant )
   paying close attention especially to details
   
2. (of individuals) adhering strictly to laws and rules and customs  ( law-abiding , observant )
   (of individuals) adhering strictly to laws and rules and customs
    Law-abiding citizens
   law-abiding citizens
    Observant of the speed limit
   observant of the speed limit
   
3. Quick to notice; showing quick and keen perception  ( observant , observing )
   quick to notice; showing quick and keen perception