[adv] in a disagreeable manner; "it's so plaguey cold!"
[adj] 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"
[adj] likely to spread and cause an epidemic disease; "a pestilential malignancy in the air"- Jonathan Swift; "plaguelike diseases"; "plaguey fevers"
Synonyms
annoying, bothersome, disagreeable, epidemic, galling, irritating, nettlesome, pesky, pestering, pestiferous, pestilent, pestilential, plaguelike, plaguily, plaguy, plaguy, teasing, vexatious, vexing