Entry 1 sense Webster, 1913 cussed /(cŭs"ĕd)/ · cus·sed · IPA /kʌst/ 01 adj. stubbornly persistent in wrongdoing; obstinate. 1. stubbornly persistent in wrongdoing; obstinate.[Slang or Colloq., U. S.] Syn. obdurate, obstinate, perverse, unrepentant.