Describes actions done covertly, often implying the person doesn't want others to see. She took a furtive look at the message on her phone.
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Suggests Guilt
'Furtive' often implies that the person is trying to escape detection due to guilt or wrongdoing. He had a furtive expression when sneaking out of the room.
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Negative Connotation
The word usually carries a negative connotation, suggesting distrust towards the person's actions. Her furtive actions made everyone suspect she was hiding something.