n. a dull person; a jerk. (From Yiddish.) : Taylor is such a nebbish. Why doesn't she just give up?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
nebbish
1907, nebbich, from Yiddish, from a Slavic source akin to Czech neboh "poor, unfortunate," lit. "un-endowed."