Definition of observant adjective from the Oxford Advanced Learner's Dictionary

observant

adjective
əbˈzɜːvənt
 
; əbˈzɜːrvənt
 
 
1 good at noticing things around you
Synonym
sharp-eyed
Observant walkers may see red deer along this stretch of the road.How very observant of you!She keeps an observant eye on developments in education.He was acutely observant of the poverty around him.
2 (formal) careful to obey religious laws and customs
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