Both of those words are defined in the dictionary and style guides, framing a common understanding that allows for comprehension, consistent use, and a cohesive and proper application.  Of course, as in "hot," "cold," "beautiful," "holy," "saintly," "competent," "lazy," etc. individual experience can guide.  

In the future I will *call you out on your continued use of equally subjective terms like "liberal," "faithful," "conservative," "authentic," "authoritative," "binding," "extreme," "immoral," "coherent organization," "radical," "traditional," "ordered," and "change." They add nothing. 

* No I won't.