sneaky

As an adjective sneaky

is difficult to catch due to constantly outwitting the adversaries.

As a noun slinky is

a toy in the form of a loose metal (originally) or plastic spring that can be made to "walk" down stairs as its coils separate and close up.

As adjectives the difference between surreptitious and sneaky

is that surreptitious is stealth]]y, furtive, [[hidden|well hidden, covert (especially movements) while sneaky is difficult to catch due to constantly outwitting the adversaries.

As adjectives the difference between sneaky and shady

is that sneaky is difficult to catch due to constantly outwitting the adversaries while shady is abounding in shades.

As adjectives the difference between sneaky and discrete

is that sneaky is difficult to catch due to constantly outwitting the adversaries while discrete is .

Dishonourable is a related term of sneaky.

As adjectives the difference between dishonourable and sneaky

is that dishonourable is while sneaky is difficult to catch due to constantly outwitting the adversaries.

Sneaky is a related term of atrocious.

As adjectives the difference between sneaky and atrocious

is that sneaky is difficult to catch due to constantly outwitting the adversaries while atrocious is frightful, evil, cruel or monstrous.

As adjectives the difference between sneaky and shifty

is that sneaky is difficult to catch due to constantly outwitting the adversaries while shifty is having the appearance of someone dishonest, criminal or unreliable; such as someone with shifty eyes.

Crooked is a synonym of sneaky.

As adjectives the difference between crooked and sneaky

is that crooked is not straight; having one or more bends or angles while sneaky is difficult to catch due to constantly outwitting the adversaries.

As a verb crooked

is (crook).

Sneaky is a related term of vile.

As adjectives the difference between sneaky and vile

is that sneaky is difficult to catch due to constantly outwitting the adversaries while vile is morally low; base; despicable.