Contumaciousnesses is a long and complex word that refers to the state of being stubbornly disobedient or rebellious. However, there are several synonyms that can be used instead to convey a similar meaning. Some examples include recalcitrance which refers to a stubborn resistance to authority or guidance, obstinacy which refers to an unyielding or inflexible attitude, defiance which refers to a bold disobedience or resistance, and insubordination which refers to a refusal to obey orders or follow rules. These synonyms can be used interchangeably depending on the context or tone of the sentence, but they all reflect a strong resistance to authority.