Etymology
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frustrated (adj.)

"disappointed," 1640s, past-participle adjective from frustrate.

updated on October 09, 2017

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Definitions of frustrated from WordNet

frustrated (adj.)
disappointingly unsuccessful;
many frustrated poets end as pipe-smoking teachers
Synonyms: defeated / disappointed / discomfited / foiled / thwarted
From wordnet.princeton.edu, not affiliated with etymonline.