sneaky
adj. B2 Upper Intermediate US //ˈsniki// UK //snˈiːki// sneaky
adj. behaving in a secret or dishonest way to get what you want. You use this to describe someone who hides their true actions or intentions.
adj. marked by stealth, furtiveness, or a deceptive lack of transparency. Often used to describe minor acts of dishonesty or clever, hidden maneuvers.
He took a sneaky look at his birthday presents.
The cat made a sneaky attempt to steal a piece of chicken from the kitchen counter while I wasn't looking.
The marketing campaign used sneaky psychological tactics to encourage impulse buys without the customers realizing they were being manipulated.
From sneak + -y.
Usage
Typically used attributively before a noun or predicatively after a linking verb like 'be' or 'get'.