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Synonyms
frus·trate (frŭśtrāt́)

[Middle English frustraten, from Latin frūstrārī, frūstrāt-, from frūstrā, in vain.]

transitive verb: -trat·ed, -trat·ing, -trates. 

    1. To prevent from accomplishing a purpose or fulfilling a desire; thwart: A persistent wind frustrated my attempt to rake the lawn.
    2. To cause feelings of discouragement or bafflement in.
  2. To make ineffectual or invalid; nullify.

derivatives

fruśtrat́er
noun
fruśtrat́ing·ly
adverb