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furtively
01
ひそかに
in a secretive, sly, or sneaky manner
例
He furtively listened to the private conversation from behind the door.
The cat moved furtively through the shadows, hunting its prey.
The pickpocket worked furtively in the crowded market, blending into the crowd.
She furtively took a chocolate from the jar when no one was looking.
He furtively glanced around before slipping the document into his bag.