adjective, sneakier, sneakiest.
like or suggestive of a sneak; furtive; deceitful.

1825–35; sneak + -y1

sneakily, adverb
sneakiness, noun
unsneaky, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sneak (sniːk)
1.  (intr; often foll by along, off, in, etc) to move furtively
2.  (intr) to behave in a cowardly or underhand manner
3.  (tr) to bring, take, or put stealthily
4.  informal chiefly (Brit) (intr) to tell tales (esp in schools)
5.  informal (tr) to steal
6.  informal (intr; foll by off, out, away, etc) to leave unobtrusively
7.  a person who acts in an underhand or cowardly manner, esp as an informer
8.  a.  a stealthy act or movement
 b.  (as modifier): a sneak attack
9.  informal (Brit) an unobtrusive departure
[Old English snīcan to creep; from Old Norse snīkja to hanker after]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Sometimes even secretive people in decline will let you look at the checkbook,
  but sometimes you have to get sneaky.
It's a sneaky hunter-it lurks unseen and then snags its unsuspecting insect
It tried to beam attention on a privacy problem of a rival, but exposed itself
  as a sneaky maligner.
He has been creeping up drafts boards into the eighth round as a sneaky third
  receiver, so word is getting out.
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