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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"beak or bill of a bird," O.E. nebb "beak, nose, face," common Gmc. (cf. O.N. nef "beak, nose," Ger. Schnabel "beak," O.Fris. snavel "mouth"), perhaps somehow connected with the source of nave (2).