stealthy

[stel-thee]
adjective, stealthier, stealthiest.
done, characterized, or acting by stealth; furtive: stealthy footsteps.

Origin:
1595–1605; stealth + -y1

stealthily, adverb
stealthiness, noun
unstealthily, adverb
unstealthiness, noun
unstealthy, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stealthy (ˈstɛlθɪ)
 
adj , stealthier, stealthiest
characterized by great caution, secrecy, etc; furtive
 
stealthily
 
adv
 
stealthiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

stealthy
c.1600, from stealth + -y (2).

stealthily
early 19c., from stealth.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sneak through a city and stealthily cut the throats of your political enemies.
If library closures cause protests, cuts must be done stealthily.
They glide stealthily through the night air as they search for food.
Over the next two days, the parasites continue to devour and proliferate
  stealthily.
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