1. (n.) No person; no one; not anybody.

2. (n.) A person of no influence or importance; an insignificant or contemptible person.

a nobody a nothing cipher common man dud dummy figurehead hollow man insignificancy jackstraw lay figure lightweight little fellow little guy man of straw mediocrity nary one nebbish never a one no man no one nobody on earth nobody one knows nobody present nonentity not a soul not one nothing nullity obscurity pip-squeak punk puppet pushover runt scrub shrimp small fry small potato small potatoes squirt squit thing of naught trifle unknown whiffet whippersnapper zero zilch