We don't have synonyms for nebbishes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are nebbish, nebbishy and rubbishes.
(n) :
One who is fearful, indecisive and timid, especially in making decisions and plans, in discussions, debates, arguments, and confrontations, and in taking responsibility.
(n) :
One who is fearful, indecisive and timid, especially in making decisions and plans, in discussions, debates, arguments, and confrontations, and in taking responsibility.