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frustrate
frus·trate /'frəs-ˌtrāt/ vt frus·trat·ed, frus·trat·ing: to make invalid or ineffectual: defeat
the remedial purposes of the Workers' Compensation Act should not be frustrated by rigid technical standards — Palmer v. Bath Iron Works Corp., 559 A.2d 340 (1989)

Merriam-Webster’s Dictionary of Law. . 1996.