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English
observant
əbˈzɝvənt, əbˈzɜrvənt, əbˈzɝː.vənt
Meaning: quick to notice things; alert
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Example
The observant detective noticed a small scratch on the lock.
Usage Notes
Can describe someone who is sharp-eyed or attentive. It can also mean adhering strictly to religious rules (e.g., an observant Jew).
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