IPA: /kɒnˈtjuːmeɪʃəsli/
KK: /kɒnˈtjuːmeɪʃəsli/
In a way that shows stubborn resistance to authority or control.
The student contumaciously refused to follow the teacher's instructions.
Contumaciously → It is formed from "contumax" (meaning stubborn or rebellious) and the suffix "-ly" (meaning in a manner). The word describes acting in a stubbornly disobedient or rebellious manner.
Think of someone acting in a 'stubborn' way ('contumax') — that's why contumaciously means behaving rebelliously.