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"stupid person," 1944, from Yiddish shmendrik, from the name of a character in an 1877 operetta ("Shmendrik, oder Di komishe Chaseneh") by Avrom Goldfaden (1840-1908), "Father of Yiddish Theater."
A stupid person, esp an awkward and inept nonentity; schlemiel: a schmendrick with a noodle for a brain
[1951+; fr Yiddish shmendrik, fr the name of a character in an operetta by A Goldfaden]