He looked over his shoulder in a furtive way. (In other words as an adjective.)
Example sentence - Her furtiveness backfired on her.
Furtive is not a noun.The man across the aisle in the bus shot me a furtiveglance.In this sentence furtive is an adjective.
They made furtive plans in the hopes of surprising him on his birthday.
The furtive cat decided that presence of the large dog was not a propitious sign.
The thief looked about in a furtive manner just before picking my pocket.
The convict made many furtive attempts to escape from prison.
His actions were secretive and furtive, as though he were planning to break a law.
The records showed furtive criminal activity.
The man cast a furtive glance over his shoulder before slipping the stolen item into his pocket.
His girlfriend has a furtive behavior, she's probably cheating on him.Furtive gossip is the main theme of Desperate Housewives.
She had a few friends. Furtive boys in pink shirts hanging about on wash-day after school. "Everyday Use: Alice Walker"
There is no common prefix for furtive.