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The Collaborative International Dictionary of English v.0.48 (gcide)

Frustrate \Frus"trate\, a. [L. frustratus, p. p. of frustrare,
frustrari, to deceive, frustrate, fr. frustra in vain, witout
effect, in erorr, prob. for frudtra and akin to fraus, E.
fraud.]
Vain; ineffectual; useless; unprofitable; null; voil;
nugatory; of no effect. "Our frustrate search." --Shak.
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Frustrate \Frus"trate\, v. t. [imp. & p. p. {Frustrated}; p. pr.
& vb. n. {Frustrating}.]
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.
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Shall the adversary thus obtain
His end and frustrate thine ? --Milton.
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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.
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