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Definition of: frustrate
(frus′trāt) v.t. ·trat·ed, ·trat·ing
1. To keep (someone) from doing or achieving something; baffle the efforts or hopes of.
2. To keep, as plans or schemes, from being fulfilled; thwart; bring to naught. See synonyms under BAFFLE, HINDER.
—adjective
1. Without effect; vain; null; void.
2. Frustrated; baffled. [<L frustratus, pp. of frustrari disappoint <frustra in vain]
—frus′trat·er noun
—frus′tra·tive adjective
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