形容词

1. 善于观察的；观察力敏锐的
Someone who is observant pays a lot of attention to things and notices more about them than most people do.

2. 严格遵守教规的
An observant follower of a religion performs all the duties that his or her religion requires.

1. paying close attention especially to details

2. (of individuals) adhering strictly to laws and rules and customs

e.g. law-abiding citizens
observant of the speed limit

Synonym: law-abiding

3. quick to notice
showing quick and keen perception

Synonym: observing