Plaguy

·adj Vexatious; troublesome; tormenting; as, a plaguy horse. [Colloq.] Also used adverbially; as, "He is so plaguy proud.".

plaguy
In the United States used adverbially, in the same sense as plaguily. The circumstances of the case...

Dictionary of American Words And Phrases by John Russell Bartlett.
plaguy sight
This is a very common expression in the colloquial language of New England, and means, a great deal....

Dictionary of American Words And Phrases by John Russell Bartlett.