furtive – adj – \fər-tiv\ – marked by quiet and caution and secrecy; taking pains to avoid being observed; secret and sly or sordid.
The middle-aged man I saw at Panera this morning, as I was waiting for my bagel. He stood up from his table and wrapped the book he was reading in the business section of the paper before picking up his coffee cup and brushing crumbs off his pants. Curious, I watched him as he waved at the employees and got ready to brave the tepid July rain. His paper was cradling a black paperback book.
Stephenie Meyer’s Eclipse.