FRUSTRATE (2)

Frus″trate (?), v. t. [imp. & p. p. Frustrated (?); p. pr. & vb. n. Frustrating.] 1. 1. To bring to nothing; to prevent from attaining a purpose; to disappoint; to defeat; to baffle; as, to frustrate a plan, design, or attempt; to frustrate the will or purpose.
Shall the adversary thus obtain His end and frustrate thine ? Milton. 2. 2. To make null; to nullifly; to render invalid or of no effect; as, to frustrate a conveyance or deed.
Syn. — To balk; thwart; foil; baffle; defeat.