observant

If you're observant, you’re paying close attention to the details. If you're really observant, you would notice the little blob of mustard on your boss's jacket and brush it off for him before he goes to his business dinner.

Your mother may be so observant that she notices every bit of dust you miss when you vacuum. But if you're so observant that you notice every coin on the sidewalk, you might soon have enough money saved to buy your mom a robo-vac. Observant can also mean that you're careful to follow laws and customs to the letter. If you’re an observant Jew or an observant Catholic, you’re following your religion’s rituals and practices very strictly.

Definitions of observant
  1. adjective
    quick to notice; showing quick and keen perception
    synonyms: observing
    perceptive
    having the ability to perceive or understand; keen in discernment
  2. adjective
    paying close attention especially to details
    Synonyms:
    attentive
    (often followed by `to') giving care or attention
  3. adjective
    (of individuals) adhering strictly to laws and rules and customs
    observant of the speed limit”
    synonyms: law-abiding
    lawful
    conformable to or allowed by law
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