Entry 1 sense Webster, 1913 Nebbish /(mĕb"ĭsh)/ · Neb·bish · IPA /ˈnɛ.bɪʃ/ 01 n. A person who is ineffectual, timid, and often luckless; a person of no significance. 1. A person who is ineffectual, timid, and often luckless; a person of no significance.