Surreptitious
/sˌɜrəˈptɪʃəs/
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Definition
(adj) Stealthy, furtive, well hidden, covert (especially movements).
Sentence Examples
There is more than a fine line between unspoken rizz and surreptitious sexual harassment.
The surreptitious gesture went unnoticed by the rest of the room.
CEFR Practice Quiz
He took a ____ glance at his watch during the long and boring meeting to see how much time was left today.