1) Adjective for Pete 2) Backdoor 3) Corrupt 4) Crooked 5) Dastardly 6) Deceitful 7) Devious 8) Dishonest 9) Double-dealing 10) Furtive 11) Like a bootleg play 12) Like a skulker 13) Like Pete 14) Like the backdoor type 15) Marked by deception 16) Mean 17) Not completely trustworthy 18) Not to be trusted 1) Crafty 2) Cunning 3) Deceitful 4) Devious 5) Furtive 6) Indirect 7) Secretive 8) Skulking 9) Sly 10) Sneak 11) Stealthy 12) Surreptitious 13) Underhand 14) Underhanded 15) Wily 
• (n.) Like a sneak; sneaking.
Sneak'y noun Like a sneak; sneaking. 
[adj] - marked by deception
underhand adjective marked by deception; `achieved success in business only by underhand methods`