Nebbish

A nebbish is an ineffectual person, someone timid, submissive, weak, helpless or hapless, a nonentity. He's unlucky, but mainly because he’s a loser right through to the core. It’s an adjective formed from one of the most characteristic of Yiddish words. It was originally "nebech". In Yiddish it was originally an interjection, roughly meaning “You poor thing!”. Americans had trouble saying this word when it first appeared in the English language at the end of the nineteenth century, and they changed it to nebbish, with nebbishy as the much less common adjective.