Source : WordNet®

sissy
     adj : having unsuitable feminine qualities [syn: {effeminate}, {emasculate},
            {epicene}, {cissy}, {sissified}, {sissyish}]

sissy
     n : a timid man or boy considered childish or unassertive [syn:
         {pantywaist}, {pansy}, {milksop}, {Milquetoast}]