pleb /plɛb/noun 3adjective 2forms 1 noun3 •A commoner; a member of the lower class of a society. •(offensive) A common person; an unsophisticated or cultureless person.You're under my roof, you pleb. — 1795 •(slang, disapproving) A freshman cadet at a military academy.I found some of the novices, plebs they are called, home-sick, and weary with their discipline. — 1838 adjective2 •Of or concerning the lower class of a society. •(offensive) Undistinguished, commonplace, unsophisticated, vulgar, coarse. formsplebs