adjective, peskier, peskiest. Informal.
annoyingly troublesome: bothered by a pesky fly.

1765–75; alteration of pesty (pest + -y1)

peskily, adverb
peskiness, noun

vexatious, irksome, bothersome, pestiferous. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pesky (ˈpɛskɪ)
adj , peskier, peskiest
informal chiefly (US), (Canadian) troublesome: pesky flies
[C19: probably changed from pesty; see pest]

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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Word Origin & History

1775, originally in New England dialect, perhaps a dial. formation from pest (cf. plaguy "confounded, annoying, disagreeable"). Partridge suggests an origin in Essex dialect.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We don't spend eight hours a day at one site with a pesky boss constantly
  looking over our shoulders.
He climbs an adjacent tree and attempts to knock the pesky clump down, but it
  refuses to yield.
Keep a special eye out for a pesky poltergeist: rumor has it that he's knocked
  over a tripod or two.
There were always the pesky squirrels wreaking havoc with our best-laid plans.
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