wonderbread adjective 3noun 2forms 3 adjective3 •White with brightly-colored spots. •(slang) Synonym of white bread (“bland, boring; conventional”). •(offensive) Synonym of white bread. noun2 •Synonym of white bread (“the food”). •(offensive) Synonym of white bread (“white person”).One of the wonderbreads had motioned me to rack up. — 2003 formswonderbreads · more wonderbread · most wonderbread