Sneaky

['sniːkɪ] or ['sniki]

(adj.) marked by deception; 'achieved success in business only by underhand methods' .

Inputed by DeWitt--From WordNet

(n.) Like a sneak; sneaking.

Checked by Balder

You're worse than sneaky. Ernest Hemingway. A Farewell To Arms.
Am I sneaky, Fergy? Ernest Hemingway. A Farewell To Arms.
You have no shame and no honor and you're as sneaky as he is. Ernest Hemingway. A Farewell To Arms.

Editor: Nell