Synonyms for Pesky (same or very similar meaning)
WordNet sense 1 (causing irritation or annoyance):
annoying, bothersome, galling, irritating, nettlesome, pestiferous, vexatious, pestering, plaguey, plaguy, teasing, vexingWordNet sense 2 (not to your liking):
disagreeableFrom the ODE community, based on WordNetadd/edit