Elusive; difficult to capture or observe due to constantly outwitting the adversaries.
Catching those thieves will be hard: they're so sneaky!
Dishonest; deceitful.
They played a sneaky trick on us.
Any device used for covert surveillance.
[…] in cooperation with the National Security Agency, installs and maintains "sneakies" throughout the U.S.S.R. and Communist China — but increasingly, denied areas are surveyed more simply.
From sneak + -y.
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