Definition of "curst"

“Stay back!" She swung the sword at him, praying she could actually use the curst thing.

2011, Sabrina Jeffries, How to Woo a Reluctant Lady‎ (fiction), Simon and Schuster, page 350

[...] what hangman hands / Pin to his breast a parchment? His own bands / Read it. Poor traitor, spit upon and curst!

1855, Robert Browning, Childe Roland to the Dark Tower Came, section XVII

But alas, we are at the far north end of NJ-and our younger daughter has the thrice curst SATs on Saturday.

2009 April 18, Lavannah, “Big, Broad, Flexible Religion (comment)”, in The Gods Are Bored‎, retrieved 2013-05-13