"observant" in the adjective sense
1. observant
paying close attention especially to details
2. observant, observing
quick to notice showing quick and keen perception
3. law-abiding, observant
of individuals) adhering strictly to laws and rules and customs
"law-abiding citizens"
"observant of the speed limit"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License