Furtive

Furtive

<fur-tiv>

secret; hidden; covert;

doing something in a sneaky way so you don't get caught.

She gave him a furtive glance and he knew what she was thinking.

Remember:
Furtive reminds of secretive

At work:
He took furtive notes so I know he is interested in the deal.

(c) 2015 E. Carruthers