Sutile means clever in a quiet or not easy to see way.
Being sutile is usually a good thing, like when you solve a problem in a clever way.
Examples:
She came up with a sutile plan to catch the mouse.
The sutile fox outsmarted the other animals.
The sutile cat quietly snuck up on the bird.
The sutile rabbit tricked the bear and got away.
The sutile detective solved the case in a clever way.
He used a sutile trick to win the game.