IPA: /ˌkɒn.tjuːˈmeɪ.si/
KK: /kɒnˈtjuːməsi/
A stubborn refusal to obey or comply with authority, especially in a legal context.
The defendant's contumacy led to a contempt of court charge.
Contumacy → It is formed from "contumax" (meaning stubborn or rebellious) and the suffix "-acy" (indicating a state or quality). The word "contumacy" refers to the state of being stubbornly disobedient or rebellious, particularly in a legal context.
Think of someone being 'stubborn' ('contumax') and in a 'state' ('-acy') of disobedience — that's what contumacy means.
No commonly confused words.