What is "disannul"

Disannul \Dis`an*nul"\, v. t. To annul completely; to render void or of no effect.

For the Lord of hosts hath purposed, and who shall disannul it?
--Isaiah xiv. 27.

Note: The prefix in this word an its derivatives is intensive, and not negative.

vb. To annul, do away with; to cancel.