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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.