Use 'surreptitious' to describe actions with intentions hidden from others, often implying something mischievous or forbidden. The students shared a surreptitious sign, plotting a prank on their teacher.
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Subtle Movements
'Surreptitious' often refers to small, almost invisible movements made to avoid detection. With a surreptitious motion, he slipped the note into her pocket.
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Concealed Emotions
Emotions or feelings can be described as 'surreptitious' when they are kept hidden on purpose. Her surreptitious joy at the news was unnoticed by others.