IPA: /ˌdɪsəˈbiːdiənt/
KK: /dɪsəˈbiːdiənt/
Not following rules or instructions; refusing to obey authority.
The disobedient child ignored his parents' requests to clean his room.
Disobedient → It is formed from "dis-" (meaning apart or away) and "obedient" (from Latin "obedientem", meaning to obey). The word describes someone who is not obeying or is apart from obedience.
Think of someone who is 'apart' ('dis-') from 'obeying' — that's why disobedient means not following rules.