Definition of "plaguy"

"None so deaf as those who won't hear. Now this plaguy old woman will keep me bawling for an hour; it's always so when I'm in a hurry."

1832, Letitia Elizabeth Landon, Heath's Book of Beauty, 1833, The Knife, page 119

He got so frightened about his plaguy soul, that he shrinked and sheered away from whales, for fear of after-claps, in case he got stove and went to Davy Jones.

1851 November 14, Herman Melville, chapter 18, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley

“If you hadn’t all been in such a plaguey fuss when we were starting, I’d have brought some pillows,” said Mrs. Beaver.

1950, C. S. Lewis, chapter 10, in The Lion, the Witch and the Wardrobe, Collins, published 1998