Слово "furtive". Англо-русский словарь Мюллера

He no longer sprawled and straddled, and already he was developing the gait of his mother, slinking and furtive, apparently without exertion, yet sliding along with a swiftness that was as deceptive as it was imperceptible.

There was a slight, furtive boy whom no one knew, who kept to himself with an inner intensity of avoidance and secrecy.

“Something furtive,” Aunt Alexandra said.

"I've heard that too," whispered a third student, and there were furtive nods from around the table.

The sales clerks behind the fish counter stood as if petrified, their knives in their hands, the lilac foreigner swung around to the robbers, and here it turned out that Behemoth was mistaken: there was nothing lacking in the lilac one's face, but, on the contrary, rather some superfluity of hanging jowls and furtive eyes.

Simon turned and saw a wizened, furtive-faced little man in an oversize raincoat standing beside him.