What is vexatious; troublesome; tormenting; as, a plaguy horse. [Colloq.] Also used adverbially; as, "He is so plaguy proud." Shak called?

plaguy — Vexatious; troublesome; tormenting; as, a plaguy horse. [Colloq.] Also used adverbially; as, "He is so plaguy proud." Shak. (Webster's 1913.)

Sources