PESKIEST
PESKY
annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguy, plaguey, teasing, vexatious, vexing
(adjective) causing irritation or annoyance; “tapping an annoying rhythm on his glass with his fork”; “aircraft noise is particularly bothersome near the airport”; “found it galling to have to ask permission”; “an irritating delay”; “nettlesome paperwork”; “a pesky mosquito”; “swarms of pestering gnats”; “a plaguey newfangled safety catch”; “a teasing and persistent thought annoyed him”; “a vexatious child”; “it is vexing to have to admit you are wrong”
Source: WordNet® 3.1
Adjective
peskiest
superlative form of pesky: most pesky
Source: Wiktionary
PESKY
Pes"ky, a. Etym: [Etymol. uncertain.]
Definition: Pestering; vexatious; troublesome. Used also as an intensive.
[Colloq. & Low, U.S.] Judd.
Source: Webster’s Unabridged Dictionary 1913 Edition