ultraleftist /ˈʌl.tɹəˌlɛf.tɪst/adjective 2noun 2forms 3 adjective2 •Extremely left-wing. •Of or pertaining to ultraleftism. noun2 •An adherent of ultraleftism (all senses). •(disapproving) An extreme or uncompromising leftist, particularly an adherent of orthodox Marxism. formsultraleftists · more ultraleftist · most ultraleftist