Sentence:  To compel a state, upon theories of doubtful statutory interpretation, to appear as defendant suitor in its own courts, and to litigate with private parties as to whether it had <WSD>abnegated</WSD> its sovereignty of exemption, would be intolerable. 
Meaning of the word marked with <WSD> tags:  To deny (oneself something); to renounce or give up (a right, a power, a claim, a privilege, a convenience). (First attested in the early 17th century.)<ref name=SOED/>