I'm interested in understanding the meanings of the 2 words :

> 
> contumacious - Wilfully obstinate; stubbornly disobedient
> 
> 
> 

and

> 
> contumelious - Arrogantly insolent
> 
> 
> 

in the context of their word roots. It seems that they have at least 1 root in common, so it would be nice to know the other 2 different roots, and their other usages in English words (if any).